Imo this is the most interesting question so far.
I think a good partner should respect your work as a poker player. If you are a (semi-)professional, then this is your job. Can she be mad at you if you work at a regular job on a weekend? Ofc not, it would be ridiculous.
Of course you shouldn't go too far, like if she only has freetime on the weekends then ofc you should go out with her, and if you have your best friends birthday then you shouldn't grind either ♦ But, as much as it is possible, she should try to get freetime on weekdays too, changing shifts and whatever.
Alternatively, you can tell her that you will play in weekdays instead of your weekend sessions, and ask her to pay the expected difference of your profit. That should open her mind
One more thing, always clarifying your grind-time in advance will help. If you tell her that you want to grind on saturday in advance, then she'll probably find her gfs and have fun with them, so everyone is happy.