I just did a quick search and found this one. Looks like it makes a small Mickey head. It doesn't sound like it's Exactly what she's looking for, but she could always make a square, make these, and then sew them onto the square... She could make then bigger by using a bigger hook too.
http://www.ehow.com/how_5834459_crochet-mouse-head.html
Instructions.Things You'll Need:
•Crochet hook F
•worst weight yarn(whatever color you desire)
Step 1
Before you start crocheting, decide what color yarn your going to use to make this mouse head. for the one pictured above I used worst weight yarn and crochet hook F. But depending on the size you want your mouse head to be any size yarn or hook can be used.
Step 2
Chain 4 join in fourth chain to form a ring
Step 3
Chain 3 make 11dc in the ring join with slst in the top of the beginning chain 3. this will be the head
Step 4
Chain 1sc 5hdc 1sc in the same stitch as the slst. slst in the top of the next dc. 1sc 5hdc 1sc in the top of the next dc
Step 5
fasten off and weave the yarn into the stitches
.Tips & Warnings
The best way to get the size mouse head that you are trying to create make a couple of them using different size hooks and yarn types. A bow can be added to give it a girlie look.This pattern is not to be sold, But items that you make from this pattern are your property.