IT might not be that she is doing this because you like it, but because she responds negatively to that level of attention. She may misinterpret excitement. The thing about autistics is that our brains interpret things differently then other people's brains do and therefore we react differently then what others expect us to do.
I am autistic and have four children on the spectrum- the first AS from the beginning, the second two seemed 'normal' until 13/14 months and then regressed, and the fourth, age one now, has the aspie personality. She was very ill with her 4 and 6 month shots so she is not having her 1 year shots right now, hopefully she won't regress like her sisters did.
Autistic children are extremely hard to potty train, what you are experiencing is very normal. I started potty training my girls at 22 months or so and yet the first was not potty trained until age 4, The second is 4 and is still not fully trained, the third is 3 and not fully trained, and then of course the fourth is just a baby.
There's a book on potty training autistics, you might want to look that up on Amazon. Someone else posted to me on potty training ABA style, hopefully she'll write to you on it.
Could school have something to do with her regression? I know that for me, school was full of confusion and excessive stimuli, and I even peed in the chair a few times in kindergarten and first grade- soooo embarrassing when I think of it now, but I don't think I felt that way then! Elimination is necessary and I can't tell when I need to go to the bathroom until RIGHT THEN and can't control it, so it's not surprising I peed in the chair. At home I went to the bathroom when I felt I needed to, at school I could only go at certain times. When my mom started homeschooling me in fourth grade things got a lot better.
Feel free to pm me.
S., mom to four sweet little 'high spirited' girls!