I used to teach the potty-training class in the preschool/daycare setting. I also have a child who was diagnosed with PDD. I hope you will take my advice.
To answer your questions:
1. Do you limit fluids?
Not until just before bedtime. Actually PUSH fluids (offer salty snacks to make her more thursty). This will make her have to GO more and give you the opportunity for more success.
2. When is the last Sippy of the night?
I recommend about 1 1/2 hours before bedtime. Continue going to the potty to allow her to empty out. Also, take first thing in the morning and after nap. This will usually be the times for the BEST success.
3. Other suggestions other than pull ups that help?
Since you are going to use Pull-ups, you may want to try going outdoors with NOTHING under the dress and take the potty seat outside with you. This is an easy way to start her realizing what it "looks like" to tee-tee (it looks different when you are not in a diaper/Pull-up).
Because of the language delay, pick your "words" and stick with them to keep any confusion down. I always used: Potty, poo-poo, and tee-tee. They are very simple and they are not as imbarassing as some when in public.
Even if she IS PDD, she may understand MORE than she is letting on. Continue to talk to her (the more the better).
4. Any other handy advice!
*Get the potty chair AND the toilet insert (makes the toilet seat smaller for little bottoms).
*Take a bin of toys/books/puzzles/activities that can be easily washed or replaced into the bathroom (spend time with her until she is able to sit by herself). Distraction allows kids to relax and GO.
*Put a TV tray in the bathroom for when she is on the big toilet (this gives her a table to do activities and helps keep her on the potty).
*Get a potty training doll. This will give her a chance to "teach" which I have found is the BEST way to learn. It also helps to teach her how to poo-poo in the potty. (I used Tootsie Rolls for the doll's poops.)
*Use a timer. Start with 5 minutes of sitting. If you do not have success, add time next time. Do not let her know how much time you are setting the timer for, but tell her you are setting the timer and she can get up when it goes off. Then put it outside of the bathroom door. If you get a timer that does not beep as you set it, you can add time if she is sitting well when she is not looking.
*After she gets up, set the timer for the 15 minutes and keep the timer with you, but where she can hear it. When it goes off, tell her, "It is time to go potty." If you have to GO, do it first and talk to her about what you are doing (this shows her what you are wanting her to do). Do not make the mistake of ASKING her if she has to go; this gives her the opportunity to say, "NO." Instead, TELL her that it is time to go.
*The timer can be used for a LOT of things for a child with PDD (or ANY 2yo). Pottying, eating, time out, nap, etc.
I know this is a LOT, but I hope it is helpful. If you have any questions or want any other information about what worked for me, please message me.
Blessings,
P. <><