I would end up going "troll" on her, posting correct info, spamming it, being rude about it, pushing the guilt on thick lol! But thats cause im just so irritated by her doing this when some try SO HARD to do things right, or hold back but then careless "know-it-alls jump in and kill stuff.
"Oh youve had bettas before? Well then youd know they are tropical, need 78+ degree water always, food variety, water changes, and they can sometimes live a few years, not just 6m-1y. Youd also know they they will kill their own gender but ALSO the opposite gender, and the only way that they willingly breed is with weeks of proper conditioning which is totally different from their usual care. If they did happen to breed youd know that they secrete a hormone that stunts growth so water changes will be FREQUENT, fry are sensitive, temp needs to be 80+ at all times, fry are a dot in a tank, therefore their food is microscopic, and it has to move ectect" AHHH! Sorry your having to watch this. =/
RIP to my little Coraline.