I'm sorry is she dumb? Like legitimately stupid. The logic here makes no sense. How the hell is them having two children at the same time PROOF that they hooked up?
Granted I know little about spirits reproduction, so like can men give birth? Is there an exchange where the male and female spirit both give birth to the children? But then we've not seen a single pair of spirit kids to date from both parents. The only other possibility is having twins, but is that like not rare or something?
I mean there's literally nothing liking the two having actually hooked up other than "he's always asking her", but like did she block out the part where Snowlea's always saying no? It sounds like they spent quite a lot of time together at one point or another.
Like I'm just trying to contextualize this. She found out her crush had a son and her crush's crush had a daughter around the same age. Not that they had gotten together mind you, but that they grew up and had a kid. And her immediate thought was that he wore her down and they pumped out two kids within months of each other.... and that made sense to her? Not only that it made so much sense she wouldn't listen to the person in question telling her it's ridiculous?
Sounds like they need to make a mental ward for spirits. Even Mr. Flame-O isn't that much of an overbearing hothead. He has no tact and is about to be canceled with his words, but he doesn't get aggressively violent over it and isn't full on delusional.