I've done a lot of restructuring and hiring where I work, and the situation I can imagine here is that they started hiring for your position, but something happened that put the other 3 on the front burner. They are trying to sort out not only who can fill the positions but if that level of help is going to be enough to go around, or if they need to look at shifting other people in to fill gaps. (been there, done that.) So, no, I would not assume the job is no longer available. I also would not assume you got the job. Sounds like they had barely started interviewing for it.
Considering it takes a good month to fill an average position, I wouldn't panic yet. She did say she would get back to you when it was time to hire again. I would wait at least 6 weeks, maybe 8, to contact her. And keep it brief. "Hi, just following up on our email from 2 months ago, hope your search is going well. If the position I interviewed with is still available, I am still quite interested in being considered for it."
Waiting the 6-8 weeks to get back to her will prevent you from looking like a stalker, will remind her of your existance, and finally demonstrate initiative to her. Good luck!