Mother and Daughter Problem
The script included a line to the effect that the mother was sixteen when she had the daughter, but even so - I think you could have swapped the roles around and it would have scarcely been less believable. The relationship jarred for me and made the whole film seem a little bit unbalanced - a younger looking 'daughter' and/or an older looking 'mother' would have helped quite a bit.
I believe there is a 4 year age difference between the two actresses and it looked like exactly that on screen to me.
AndyG