How long have you been dating? I think "taking a break" is an excuse for avoiding either 1) actually breaking up, or 2) talking through your problems. If some serious and deep discussion can't get to the root of your issues, then time apart certainly won't help. If you love her, tell her you're not willing to take a break. Convince her you love her enough to sort through your problems. It will reassure her that you are serious about the relationship and hopefully, if there is an impetus to her wanting to be apart, she will come clean.
I wish the best for you. Talking is the hardest part, at least it is for my SO and me, but you have to do it and you have to be totally honest with each other. There's no point in wasting time, be it not staying together or staying together, whichever case may prove appropriate.
