Annoying ass sister in law

Guys my boyfriends (bf of 4 years), sister is always self inviting herself to hang out with my bf & I & it’s so fucken annoying because I don’t work as it is right now & sometimes only have enough money for the 2 of us & she doesn’t know I’m paying & she just invites herself in for everything. & when she asks whose paying, my bf looks at me but I stay quiet 🤷🏼‍♀️.

We don’t ever have any quality time anymore bc she’s always around I swear they too close. I already spoke to him about it but I think he is low key scared of his older sister. We’re 21 & she is 25.

Her man is jail & she has no friends. I have nothing against her but I never had my boyfriend all to my self anymore.

& no I’m not cool with her always being around