

Friend's cat experiencing eye inflammation, and they can't get to the vet. Any advice appreciated.
Basically the title. My friend's cat is a domestic short hair cat who was a runt, about 8ish pounds, she isn't spayed (friend is 17, his mother is broke and refuses to get the cat spayed). The cat is roughly 8 years old.
Over the last few days, jewel's (the cat) left eye has swollen around the nicitating membrane and eyelids. Along side that, her eye has producing plenty of discharge. Before the swelling occurred, she was blinking more frequently than usual. The eye itself is fine, its more the tissue surrounding it that's concerning.
Her right eye is completely fine. Does anyone have any idea how serious this is/what could've caused it?