Is my daughter a “bad test-taker”

I’m at my wits end. I have an 11 year old who just started middle school this year. She’s doing well in all her classes… except for Math (low 70s). It’s so strange. She does fine on the daily assignments (As). We study together SEVERAL times a week. But when it comes to test time, she’s getting 50s and 60s. Today she had her 4th test, and she called me from school crying wanting me to come get her, because she said she bombed it. I just emailed the teacher to get a printout of the test so I can see the answers my daughter chose. The tests are online. But, I’m so hurt. We studied so much. Are bad test-takers really a thing? I’m not a parent who doesn’t want my kid to be held accountable. However, I don’t feel like she’s struggling due to not knowing the material. It’s something else. How can I help her?