cause of spoilers
She is a self-centred, selfish & greedy person, in simple words a "bitch". You will know in the future chapters.
How come? If throug she realised edgar dose not love her romantically. She was willing to save his ass. But he had no problem cushing her dreams so she would be stuck in manor. How come she is the selfish one? She was wvene pissed at pascal for threatening edgar. She accepted edgar for who he was and what did she I'm return? Being thrown under the bus.
Why do people not like June? She hasn’t really done anything bad so far