This girl bombed me with tons of messages the last one being "Forget it, i'm angry about you."
I'm well aware that this is a shit-test but I have no idea how to respond.

Should I just tell her she's being childish or ghost?

EDIT: just checked all the messages. Turns out she was asking me if I'm down to go to her place, might go to her place unannanounced see what she says.

EDIT:
Responded with "hmm?" (to covertly say "wtf is your problem")
she replied saying she's busy and can't meet atm.
So I said "really? already on my way to your place" (which was not the case) and got her to apologize but she said she's not home because I didn't respond quickly enough (blaming me so not really an apology) and she already has other plans.

Now, I don't really want to pass that offer of going to hers so should I just ask her if she's up for it tomorrow or ignore her until she messages me again.