>>10418503>>10419119basically this. don't ask for money.
The only time this is remotely appropriate is if you haven't accepted the admission offer yet. It's acceptable to ask for more funding beforehand in that case, although you really only have a shot at getting this if another campus is offering you more money and they really want you to go there instead.
You signed on accepting a certain amount of funding, and that's what you're going to get.