Grow arms.
You grow an arm. But it's crude, and is likely only a temporary solution.
But hey, it's the first mostly successful thing you've done so far! Maybe you can wrap it around stuff and move them?
Give it sentience, and grow genes to love her.
You're not sure how to give it sentience, so you replicate most of your non-gender-specific genes and send them over to the female Chell. She takes them in, although it might be a bit before she fully accepts the DNA.

You also write the genes to enable yourself to love the female Chell. You think that's what they'll do anyway.