(NSFW) My girlfriend seems to always want sex or to do sexual stuff, to the point where it's downright annoying- what do I do?

This is a trainwreck of a summary but here we go.

I’ve been with my girlfriend for about ¾ months, we’ve had a pretty active sex life together up until 2 or so weeks ago when I had gotten incredibly ill (severe strep/tonsillitis, but the doctor never really knew since the tests came back negative for both) for about a week and was bed-ridden for most of it. During this I didn’t want to be shoving my tongue down her throat/make out because well; I was sick- duh. She didn’t like that at all and said she didn’t care and got upset because I didn’t budge too much from my stance.
Fast forward to today; I’m almost fully recovered but my throat still has some white spots and my tonsil is still a bit enlarged but I feel fine. I’m still not full on kissing her and I’ve been against having sex for the most part except for two times when she just pushed me to the limit and I gave in to avoid making a huge fuss. Anyway; today I just get back from the dentist and I start making myself some food since it’s been a day since I’ve eaten, and started up my computer so I can get at the mountains of homework I have. She starts rubbing at my crotch while I’m starting the food and I just ignore it but give her a hug and a peck on the cheek and say “not now” to which she replied “but I’ve been so horny”
I didn’t know what to say so I kept making my food and she started to leave, I asked if she was mad and she said no- but she was upset. I’d explained multiple times that my sex drive isn’t very high at all which she took offense to because she was apparently forcing me into sex—ANYWAY she sent me a text while my food was cooking saying “so you’re seriously not interested. . .”

:|

my girlfriend always seems to be after sexual attention and it’s getting to be annoying because it seems that’s all she really bases the relationship on at times, and it really bothers me but no matter how much I try to explain to her that sex isn’t everything she’s still all over me, wat do :(

edit: this unbalanced sex thing has been going on for awhile and she always takes it personally and gets mad if I do not oblige, and it’s making me consider withholding it because of it- opinions?