----既然你们有joint account, 你把所有的支出都放到里面,然后再拿出来用,这样你老公也知道你每个月付出多少,是你在养这个小家.
"是你在养这个小家" --- will this change/move her hu*****and? It seems her hu*****and likes to control her money but not his. He is willing to spend big money on his mom and brother but not his wife.
If I were her, I would put aside some money in case. And if the marriage can be saved, this money can be put back to use for small family in the future, if not, LZ can have some backup to keep her and baby in stable financial situation.