Point out the problems with the plan. Little things that might help but she would probably still get caught. It's pretty dumb to rob a bank with all this surveillance around. Phones telling your location and all.

Try to set up a alibi for it. Don't use a gun. Just slide a note to the teller demanding money. Most of them will just comply. That way you won't get an armed charge. Also wait for a snow storm or something. One morning with a lot of accidents, but the bank demand the workers come in anyway. That way the emergency vehicles and cops will take longer to get there. The snow tracks might give you away a bit but you can probably plan the getaway better.

Anyway, I don't think it's worth it. It would be better to get a job there and try to figure a way ahead on the inside.