I had a similar situation with my daughter at the same age, one weekend she read her book but I forgot to sign the reading record, cue sniffy comment from the teacher re signing reading record.
It hit a nerve and I went into meltdown
DD's homework hadn't been marked or acknowledged for 9 weeks. I thought about it carefully over the weekend and then acted.
I penned a snippy letter reminding them that homework a contract between school ad home and if DD gives up her time to do it the least they can do is mark it
stapled it into her reading record and waited.
Cue all her homework marked up to date and no nonsense again. Ironically I work at the school now 