Well, she said Like, not Love. Its not uncommon to have an interest grow from a first encounter. (isn't that actually normal?) Heck, i give her props for being up front about it to the other girl, especially checking if she would be stepping on toes. (which she has asked about, multiple times so far.)
I expect it to settle into a small friendly rivalry the MC will be oblivious to however. (my prediction folks!) The series feels too mellow for a Nice Boat or Drama Llama swerve.