I do the same thing with DD (2.5) but I really don't know and can't tell when I'm asking too much because she does actually rise to the occasion most of the time. My biggest problem is I have nothing to compare her to as she is my first child.
For example she was potty trained at 20months but wears a diaper at night. She asked if she could wear underwear to bed and I said no (because she always has a wet diaper in the AM). We compromised on a pull-up. Last night she wore one but I had closed her bathroom door (with child lock). She was beyond PO'd in the morning because she said she couldnt get in the bathroom (oops - but really I didn't think she would try it). So tonight I left the bathroom door open but gave her about a million instructions about leaving TP in potty, putting back on pull up, not going back in room without pull up, ect ect.
We will see how it goes!
How can I tell what normal expectations are for a 2 1/2 year old?