My 6 yr old little girl regularly mixes up b and d, however their seems to be an inconsistent marking system in her book, a few weeks ago she wrote the words with the d as b and got them marked correct, a couple of weeks later they did some other spellings with b and ds and she again did the same but they marked them wrong. Last week she got 3 out of 8 in her spellings but the three she got right were mend, send and bend, which she had wrote as menb, senb and benb the teacher marked them correct, this week she again got 3 out of 8 and one of the words she had was dish she wrote bish and they marked it wrong. It just seems so inconsistent and im not sure whether they should be mentioning it to them as it seems unfair to tell her one week its correct and the following week its wrong when she writes that way. Would you mention it?