Selling everything she has is not enough to support herself and her younger sister in the long term.
She did punish/defeat her father and older sister in her own way. (I also read the raws)
The father won't get out until his gambling addiction is cured and that will take a very long time or never. Daisy has distanced herself from her family (father and older sister) and put them in their places. She even told her backstabbing cunt sister that they are no longer family and until the older sister change for the better she shall not reappear bevor her again.
I think it did make sense for her to ally herself with the ML. With the support of the ML to build a fortune on her own and send her little sister to a prestige academy.
It is her way to do smart businesses.

she honestly should have just sold everything she could before it would get taken away and run off wih her sister rather than staying and trying to save the goof for nothing father and sister. now that the whole family is saved, who says the father won't go gambling again and put her younger sister in a worse situation than now. idkkk but if she didn't want any of this to happen, she shouldn't have walked right into it. (of course that's how the plot has to go so the MCs can end up together tho)