My question involves criminal law for the state of: Illinois

Ok so what's going on is that my ex's girlfriend keeps calling me once or twice a day for some reason and the one time I pick up she just stays quiet and hangs up on me, and even though I don't pick up anymore she still calls on a daily basis. Now this has been going on for about two weeks, not to mention she used to send me rude texts and emails last year when i was pregnant, so it's not the first time she's been trying to bother me. I am getting annoyed with this situation and I want to know if I can do anything regarding the matter. Can I press charges on her? Maybe a restraining order? I want to know my options.