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There are other posts today about CK removing remarks from every account. It sounds like a CK glitch. It had nothing to do with her score drop (I bet her utilization went up or she has a new account post).
I would almost 95% guarantee it's a CK glitch. Remarks don't affect scoring.
If she's worried, have her order her free annual reports as soon as she can.
I too noticed some weird remarks being updated as removed on CK over the weekend. Can I purchase a copy of my credit report from annualcredit.com? I got my free copies several months ago, but since then, some changes happened. I'm thinking of getting a new copy to double check if all updates are correct. Thanks