Hi there,
The worst thing you can do is push your daughter if she is not ready.... my friend's pediatrician once told her, "a young child can only have control over one thing in life... that is food (drink), going in and coming out". The more you push it, the more they try to control it! I found that to be true for my older daughter. She was also advanced/early with everything... walking, talking, recognizing numbers/letters etc. We decided to try to train her at 2 and 1/2 thinking that she was more than ready. Well, she wanted the control... we put her in underwear one day and she didn't want to use the potty, but would not pee in her underwear either. She did the pee pee dance for hours and trying to get her on the potty was a fight. Because we had just had a baby and moved, it was probably just not good timing (for her). Anyway, we dropped it and several months later we tried again... it was a bit of a control struggle at first, but we just took the diapers away and let her use the potty when SHE needed to. We refrained from asking her or telling her she needed to try. Well, it only took a couple of days, BUT she was a month shy of her third birthday. My son, though started showing interest early, was also fully trained a month before his third birthday. And, most people I know have stated that thier children are not fully trained until almost 3. At this age, the children can verbalize the need to go, wait briefly if needed, pull pants up and down, get onto the seat themselves etc. Most kids who have just turned 2 can not do all of these things yet. So, even if they do use the potty, they generally have to be on a schedule, need help with pants etc. In my opinion, when a child uses the potty early, it is the parent that is trained, not the child (ie. they know the childs schedule, when to bring them etc.). As far as you MIL goes, it is really not any of her business. Tell her directly that, although you know she just wants to help, that you know what is best for your child and you don't think pushing her is the best method. Being potty trained is not a symbol of status or how smart your kid is, and you would rather wait until she is ready so she can master the skill rather than pee all over the floor constantly and "pretend" to be trained". After toiled training 2 of my own and having lots of friends and relatives that have gone through it, I think the best thing to do is introduce the toilet around 18-24 mos. Let them sit on it, look at it etc. If they actually pee or poop on it praise them. Let them watch you or older siblings. Once my son was 2ish, we had him sit on it every night before bath as part of his routine (because his sister did). Make sure they can stay dry for extended periods of time etc. Once you think they are truly physically ready, just take the diapers away (except while sleeping) and make the potty easily accesible. It will be messy for a couple of days, but it works if you are consistant (and in my opinion, works well and quickly more often when the child is closer to 2 and 1/2 or 3). It's not worth stressing over, she is still young!