advice please

So I have a science test coming up next week. The girl I sit next too ( who is also in my friend group) will def be checking my answers during the whole thing. The tables can't be disconnected so you can see what the other person does during the test. I love her but at the same time, it is a test and if she is using my knowledge, she might as well wirte my name beside hers on the test papers. I don't want to miss the test bc it results in a reschedule but I don't wanna snitch either.
Should I confront her during the test and ask her to stop or should I pick the wrong answers and then change afterwards? I don't want to ruin our friendship and I'm worried she might tell other people in our friend group that " That is not what friends do"
Advice please !!