K.S.
That is great that you are paying attention to her "signals". My daughter was completely day trained at 21 months and night trained shortly after and I really did nothing except follow her lead.
Try setting a timer, not only for her, but for you. Set is for, say 45 minutes and each time it goes off, have her sit on the potty for no more than 2 minutes. If she goes, great, make a big deal, give her an M&M treat or reward of some sort (you can weed these out later). Put her in underwear (no going back) and if she has an accident, help her clean it up, put her on the potty, and keep trying. If she understands that the expectation is to go on the potty, she will learn to go there and being in underwear and going there is uncomfortable.
Just stick with it, you're doing great!
K.