Employment advice?

I’ve been looking for work for a while now, and I need some advice. I’ve applied to several jobs, and was just offered an interview for a receptionist position in a small office today. The lady sounded very eager to fill the position, and I feel like she’d offer me the job. That’s fantastic because I need a steady job, but the issue is that I also applied to be a receptionist at a mental health clinic. That job is my first choice because it goes along with my college major, plus it’s offering a higher salary.

I need to know if there is a way that I could check to see if the mental health clinic is at all interested in hiring me before I accept the other job (which has very little room for group within that company).
I’m not good with knowing what is and isn’t acceptable as far as communication with prospective employers in concerned… Should I contact the mental health clinic to see if they are considering me? Should I tell them that I have other offers, but that their clinic is my first choice?