I agree that it's a reincarnation sort of situation, where our "dreamer" is having dreams of a past life. Considering she's had this dream multiple times, it's likely that these "memories" are still unresolved, ie she hasn't met her lover's reincarnation yet or doesn't realize she has reunited with her. There's just too little information to formulate much else beyond "This is reincarnation shenanigans."
Hopefully a sequel will be produced where our mc finally meets their lover from a past life, both of them regain their memories, and they hook back up. Preferably within a more favorable environment for their homosexual relationship.