I think it was overkill. I'd be pretty unimpressed with my parents if they did something that unprofessional. I wouldn't tell anyone I hated them, but if its something thats in her vocab already, I can see it slipping out.
If it was my parents and me I would have thought a couple things:
1. Her job is silly little, unimportant. You knew beyond a shadow of a doubt that it was inappropriate to call her work place, that many times, and speak to that many people but you did it anyway. To heck with the consequences.
2. She's calling because she enjoys your company. You don't enjoy her company you just NEED to check up on her. She was going to call you when she could, no SOS, no stop the presses, just a nice friendly chat with her Mom, who she thought was interested in her life, but just wanted to keep tabs and nothing more.
3. You don't listen to what she says about her life and her friends. There was certainly someone more appropriate to call, a friend, a cousin, a boyfriend, the landline, e-mail, even a specific person at work. If you had no idea who that is, then you've been tuning her out big time.