UnNethertrash,
As a general rule, the longest visas that are granted in Israel are 3 month tourist visas. The visas can be renewed every three months, but she would have to fly out of the country for a few days, then return and get a new tourist visa. There are actually a lot of people living in Israel that do this.
The primary exceptions to the standard tourist visa are for students of Israeli accredited colleges & universities (i.e., medical students) and their spouses who can stay uninterrupted for the entirity of their studies. If you guys are not legally married in your country of citizenship there is no possible way for her to "ride" on your visa.
If you are married she could get a basic "student's wife" visa (which doesn't allow her to work), then apply to have her visa converted into a working visa. This involves finding an employer here in Israel that would "sponsor her" by writing a letter on her behalf stating that they could not fill their position with an Israeli and asking. This actually isnt as hard as it sounds because there are frequently job openings here that are only suitable for native-English speakers.
The only other possible option would be for her to declare Aliyah (i.e., declare her intention to seek Israeli citizenship).
Hope this helps...