There's a size limitation on the verizon network, it's not the phone's fault. If you want it BIG, send it via E-mail.

 

You're not doing anything wrong. Unfortunately the phone downsizes all pics for whatever reason, even if you make the max limit size the largest. The only solution to this is crop the picture beforehand.

Edit: Just saw the post above. Its not VZW's fault. I have owned many phones with them and all the MMS's I've sent are regular sized. The phone itself is making the pictures TINY.

 

What kind of phone is she using and when you say small you mean like a little thumbnail? It has to reduce the picture because an 8 MP picture is too big to send via text message.