|Report your old roommate for fraud, hacking and anything else she's done. She's broken the law, let her face the consequences. Use the threat of it to get her to sort it out if your prefer. |
In the meantime the best option is to restore your iphone to factory settings - you can do it through iTunes if you want to save your data on it, but this may also reintroduce the malware, if it's there, but if you want to be absolutely certain it's clean just do a reset from the handset itself.
"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd