Six to nine months would be nice for a woman who had just given birth I think every organization on Earth should adhere to that, in your case, it was way too early to resume work with a very tender baby, haba na it wasn't right.
Your cousin is trying in her job, if it was someone like me, I wouldn't want anyone to advise me I'd just leave cause it isn't worth it, everyone needs a break Monday to Sunday 7 am to 9 pm that's torture.