My fiance's in his first year of Dental. Having gone through the application process, I can say a few things...
It is extremely stressful (unless your gf is some kind of genious and feels she's guaranteed acceptance somewhere). For this, you have to simply remain supportive and confident in your reassurances (even if you have doubts). If she hasn't taken her admission test yet, respectfully give her time to study. No more, 'hey hunny, do you want to go do...' Not happening, there's no time. But get used to it, there's way more studying once the program starts.
It is expensive. The apps themselves are costly, not to mention the travel cost of interviews. And then once the tuition bills come... So saving now is great, and I suggest you save as much as possible. Go for something safe with high interest. May I suggest ING direct's orange savings account (no minimum, no fees) or Vanguard's Prime Money Market Fund (higher yield and free checkwriting but there is a $3,000 min to open it and you have to sign up for e-delivery of statements to avoid the yearly service fee). Also, be responsibile with your retail purchases. It seems like you're on that track, so I'll say it. Don't finance a ring, pay cash and you'll save big on the credit interest. Also, get something reasonable for now (that's what we did). You can always upgrade in the future.
As far as the job situation... The year leading up to my fiance's acceptance, I took a job an hour from home and commuted every day. My job is close to his now school. At the time I was hoping he would get in to his first choice so I wouldn't need to find another job, and I could move closer to work. We got lucky in that respect. But I was completely willing to quit my job and look for something where ever he got into school. If she's the one, then you'll do it. Even if you have to take a pay cut, there's always the living stipend loan you can take. Which is what we're doing since my salary isn't that fantastic yet. Hopefully in the coming years my salary will go up and we can take out less in loans (or none) each year. Otherwise we'll be in some killer debt.
Anyway, I hope my comments were helpful and sorry I wrote a book.