Hi, sorry I've been away - distracted by motherhood and work.
As far as I am aware DD has no issues that would explain this, which is why I find it difficult to understand and came for help. To try and answer your questions:
We have a normal, UK style loo - no shelf
This sounds gross, but she is putting her finger up her bottom to get the poo out. She used to have no trouble pooing - maybe we need to make sure her fibre levels are increased? She has a good diet, but could always eat more fresh fruit and veg as with most children!
She is not autistic. She is quite a dreamy child with an extremely active imagination. We have at least 2 of her imaginary friends in the house at any one time (one is younger and does all the naughty things, one is older and wise). She is quite an emotional child, and does not hold back in letting us know which emotion she is experiencing.
She has the most amazing feigned deafness to the point that I arranged for a hearing test that she passed with flying colours, but the result of that is that we do shout at her when we have asked he to do something three or four time politely and at normal volume. She suffered from a lot of ear infections as a baby and toddler so we do make sure she can hear clearly before getting annoyed at her not listening.
She has a little sister (2½) who has a very sweet, engaging nature. We have infinitely more patience with dd2 as she usually does as asked the first or second time and can be tickled out of naughtiness.
I have asked (with heart in mouth) if anyone has been touching her bottom, but she assures me that this is not the case.
Does this help at all?