Honestly, ignoring it almost isn't enough. You may need to start doling out consequences if she continues (assuming this is an ongoing problem) for example by picking her up when she starts this and taking her straight to her bedroom, and telling her calmly that she cannot join you again until she's calmed down. Sometimes the child needs to understand why their behavior is not appropriate, or they will just continue. But of course, you know your daughter best, so you have to make the decisions based on you and her!

Ignore, walk away. It's attention seeking behavior. Do not reinforce by giving attention.

I used to be a tantrum thrower, but also a very inquisitive child. My parents said they would put my fits to a full stop by using words I didn't know. They would walk a few feet away, look out the window or whatever and say something like "the neighbors are fastidious about their lawn care", and I would sniffle to a halt and ask what fastidious meant.

Great advice. Do not give in to terrorist demands! Hold firm, ignore, time out! When she exhibits positive behavior, then acknowledge that, but do not go back and give into her original demands. Kids pick also learn that or believe that they will be given anything as long as they ask nicely. This is also something to look out for. Good luck!

So interesting! I read the OP and was going to post right away, but a few others had commented ahead of me. And everyone is slightly different in their approach.

For me, my own DD is 21 months. She says no a lot.

If I've told her about what's going to happen, like bedtime, then I just repeat myself several times and let her gradually accept that it's bedtime.

If she's doing something naughty (like today, she pulled out the hose-thingy from the kitchen faucet AFTER she was told to stop) so I put her in timeout. I used to do those in her playpen or crib, but she's got a big-girl bed in her room already, so I just used a chair in the living room. For me it's also about obedience and listening, so practicing having her learn that me saying "Stay there" means business is good for when we're outside as well.

I did have to put her back about 20 times, and after the first two with no eye contact or conversation, but she figured out what was expected. At first she thought it was funny, but once she clued in, she got mad. Then she accepted it.

The most important thing to remember about parenting is that you're in charge. Never ever surrender your leadership position.

When DD was young and freaked out when she heard no, I ignored her and left her where she was until she got herself together. When she started following me, I ended up starting time outs with her. But they weren't time outs, per se, they were just me leaving her in a safe area to calm herself down. they later evolved into punitive time outs, but that's another story.

I agree with team ignore too!
My doctor always told me the same, just step over them and keep going about your business while they are laying on the floor screaming, eventually they will learn it does NO GOOD to throw a fit.

Shortly after my divorce, when DD was about 7, I started to rationalize and explain all the answers as to "why" she can't have what she wants, and she rightfully so, learned to "argue her point" till I was exhausted and gave her what she wanted. Bad move on my part.
I now have to re-teach the "ignore" but on a larger scale.
Last week she wanted to use my computer, I said "no, use your own" I got every excuse in the book from it loads slow to the printer isn't loaded on my computer to Blah, blah blah, about 5 excuses into it I said "Do you want to keep going? and telling me why you should use it, because it will not change my answer, no is no"
She stopped.
Sometimes you feel bad or mean, but in the end, its for their own good.