I fear her age more than I do my own:
sullen, sinking skin replacing radiant beams,
the firmness now like worn elastic.
If melting my heart was your aim
then you have succeeded,
for even though I have suffered you
I now suffer as a witness.

Bring out the old clothes from the closet;
try on your mothers wedding dress.
The great brightness in your eyes will
reflect back and remind you:
the joy of being a woman is a friend-
and I hope I will be there when she leaves,
because she will.

Please, for the sake of your child,
don't age.
Wow I really like this.

I don't know exactly where to critique this, it looks like you've been doing this for a while. Only part I'm not sure of is
If melting my heart was your aim
then you have succeeded,

I'm not sure it fits in as well with the relationship between you and the mother. However, I might be misunderstanding - either way the whole piece is solid.

If you get a minute then I've got a piece on here (Empty Minds).
Thanks, mate! I'll get to yours in a little while. I'll stick it for now.

That line you quoted could definitely be considered strange and out of place, but it's actually crucial. Firstly, I wanted to make sure the readers weren't hit with the same metaphors or imagery that the first three lines had. I wanted people to suddenly be given something emotional in its structure and simplicity.

Secondly, it is one of the main points of the piece. I don't want to sound cocky or anything but I always write with multiple meanings (which is why, I guess, people find my work so confusing), and the fact that my mother was so hard on me hasn't deterred me from loving her.