gf too clingy! Watch
Tell her to back off, but ultimately you may just be incompatible - some people like to talk lots to someone they love and some people like more space.
Then again, it might not, so it's best to be clear about what you want. If she gets upset, explain that it's not that you don't want to talk to her or see her and you don't want her to back off completely, just to cut down.
Like someone said above, if you're incompatible and she's the sort of person who would like to talk at least once a day and you'd rather wait a few days then there's not much you can do, you're just different people.