No. Grad school, if she's serious about it, means she'll be at school a LOT (good) or at home a LOT and need her study space. I cannot imagine having been in grad school and sharing a room. Nope. It will not work. Why didn't she plan on a living situtaion first. If it's a big university I am sure there's a ton of good room / apartment shares there, within minutes of campus. Check out the ads yourself to be sure.

No is an answer to this.

1.5 vs 2 hours?  She's splitting hairs.

NO!

I wouldn't even want to live with anyone at that age. Especially not in a shared room with a teen. 
a half hour isn't that much.  She can just stay put where she is.  It's a two yes :one no situation to having a free loading adult move in. 
wouid your DH be in her as far as pitching in around the house ? Not disturbing everyone at night etc.  that's going to cause unneeded stress on everyone.  No thanks 

That sounds like a disaster waiting to happen.  Stick with no.  You don't have room, and it's way too far for her to be commuting to school.  Why can't she get a room closer to school?  Most schools have resources to help students find living quarters/roommates. Your DH should advise her to start looking and she can stay with BM until she finds something.  The difference between 2 hours and 1.5 hours, for a short period of time, isn't a big deal.  Also, if she's taking public transportation, she can use that commute time for studying, so it's not a wasted hour to go further to BM's house. 

The problem with allowing her to move in, even for a semester or a month,  is it's then harder to get rid of her. 

She needs to find a place closer to her school. 

Wrong, wrong, wrong on many levels.

Its just an excuse to freeload off you guys. 
if she has not maintained a positive harmonious relationship with you and your daughter she is a stranger and your husband should not be putting you in a situation of living with a disrespectful stranger.

sure he says its 1 semester till its not and she leaves a mess. You have no room for her to move in permanently whilst she finishes her studies so leave it at that.

The living logistics are enough to say sorry, we just don't have the space.

She needs to do what normal people do and get a cheap apartment with a roommate or 3 and live close to campus. 

I feel you...I am currently getting a divorce due to a very similar situation.. My Adult Step Daughter age 21year old.. Who is not attending school.. But who works in 2 restaurunts as a waitress..Was having anxiety issues.. And my wife informed me she would be moving into our living room. ( the other 2 bedrooms are already occupied by 2 other adult stepsons ages 18 and 24) And all of this was during the peak of Covid 19. I said no she could not live in our living room, where i relax every evening.. Well long story short it was a huge blow up, and we are now 3 months into the divorce and the Laywers are $7000 dollars richer aleady..It has been a nightmare and a disaster for me personally.. 

DH do you want a peaceful marriage?

him "of course I do"

Well then it wont be if your adult DD moves in. 

Oh no. Trust me. In my past step life SD moved in for a year while in medical school. By the end of the year she said she is staying some more. Well I was out. But she lived with ex for several years after. I was already married to someone else and she was still living there!
 

And we lived in a large house. Not a two bedroom.  Still she made my life he$$ and my ex didn't put me first. So if your DH wants to live with his DD, he should get a separate place. 

And tell her to grow up and learn to drive already!

No! No room, no relationship with you, and your poor DD doesn't need an unrelated adult woman sharing a room with her. That's creepy.

You are absolutely not wrong. It is wrong for her to even ask, considering that you have no room for her and the two of you have no relationship.

Temporarily? What does that mean, exactly? Like you have pointed out, she has had time to consider living arrangements.

I found this site when my SD wanted to "stay" with us for "a couple of weeks". Only it was her, her husband, and their 2 kids. I was adamantly against it and felt a little guilty... until I found this site.

They ended up staying with one of her husband's relatives for months and months. And months. The reason they needed a place to stay, in the first place, was entirely their own doing.

My SD and her husband could have made better choices and so could your SD have done a little advance planning. This is a good lesson for her.

Absolutely NO. You don't have the space and that's that.

There is no space & that kind of commute isn't really feasible. DH can help her with an apartment close to school if he's so concerned. He should also help her learn to drive. Teaching her life skills is much more productive then sulking.