My ped told me that daytime and night time training are totally different. A child can be "ready" in their head but their bodies may not be. He told me that all the way up until 4 a child may not be able to have dry nights.
So this is how he had me do it and it worked for us. Ask your child if she would like to wear her panties to bed instead of a diaper. If she says yes, then tell her we will try it out. Make sure you have a change of bedding (you do have 2 waterproof mattress covers, right?) because if she wakes up wet and comes to you, you will need to change the bedding. (Have it out so that you don't have to hunt.) Get a calendar and some stickers. Have it ready for in the morning.
When she pees the bed, in the morning, hug her and tell her "Honey, I know you wanted to have a dry night and that you are sad about it. I understand. Here's what we need to do. Tonight we will put the diaper back on. If you can make 4 nights in a row of dry nights, we can put your panties back on. Here's the calendar. Every night in a row that you are dry, we'll put a sticker on the calendar. If you make it to night 4, we can put panties on you. Isn't that exciting?"
This way she is not shamed. You are telling her that you know she is disappointed. You are not telling her that YOU are disappointed. You are empathetic, bringing it out in the open, and presenting a plan and a solution.
My sons didn't potty train until they were 3. I didn't have too long of a time in getting mine night trained. You are starting out very early, so I don't think you'll have quick success, but I may be wrong. My older son slept like the dead and it was almost impossible to get him awake in order to take him to the potty before I went to bed, so helping out by taking him to the potty at 11:00 pm didn't work for us. You might try that with your daughter if she can stay awake long enough to pee, and go right back to sleep.
If she starts obsessing over getting up to pee and calls you all the time (like an excuse to come out of her room), put the potty chair in her room instead.
Personally, I'd keep her in the diaper rather than introduce going to the potty in the middle of the night. If she can't hold it without going to the potty 3 and 4 times, I'd rather her wear the diaper and we all get some sleep.
Good luck,
Dawn