Hi -
Sorry to see your query has been ignored for several days!
I wish I'd had a few Yr2s 'obsessed with perfection' when I was a TA - most are just the opposite, as long as they dash something down on the page, that will do!
It is a difficult situation, but as you half suspect already, it quite likely is 'learned response' from home. Like the 5yr old boy I knew who refused to use a pink colouring pencil, "because it's a girl's colour".
Do you think you could have unwittingly emphasized high standards to her when she was younger? Re drawing: could she possibly be persuaded to just do a 'draft' of a picture, say, of 'stick' people, with a view to doing a 'final version' at a later time?
Personally, I would not trouble the teacher with it at this stage; there might be more serious issues to confront in the future, that really DO need teacher intervention.
Is her handwriting too slow, or is she writing more than she needs to, and that is taking the time? Or is it only on the drawing and colouring that she gets behind on?
{AhHa! - I've just looked at your 'profile' (not many people seem to make them 'public', which is a pity, as it's useful to know a bit more background) and it looks like she has quite a lot of 'competition', with the two older girls. Might they have some bearing on the problem, do you think?}
If you wish, tell her I was a (male) TA and voluntary helper, in schools for over twenty years, and see if SHE can write about why she thinks she has this difficulty.
Sorry don't have any concrete solutions, and I hope it isn't upsetting her too much.