Interview with a professor... Does this mean I will end up with this professor?

[vialy]

A professor personally emailed me after seeing my application and asked for a Skype interview. I didn't expect getting a request from her at all since our research interests only have sustainability in common. I am actually interested in her research, but it's a lot of materials science stuff that I don't have experience in (whereas I have tons of experience with design and manufacturing, which is what I wrote about on my SoP).

So basically my questions are:

1) If it all goes well and I am accepted, will I end up working in her lab? (Like I said, I wouldn't mind at all, but only if my first choice professors don't want me. Also, her lab is interdisciplinary, so there's a possibility she wants me to work on a different aspect. I will ask her during the interview.)

2) During the interview, how enthusiastic should I be? Like "I am 100% interested in your research", even though she's clearly seen my SoP, and I am hoping other professors take an interest in me?

3) What should I say about my lack of experience in her main area of research?