Can someone be a lesbian in a 2 year relationship with a guy?

well there's this girl she's been dating a guy. She thought he was a girl when they first met. This guy has very pretty aesthetic feature voice hadn't come in yet. He had no facial hair and very skinny but tall. He also acts very feminine. But he's a guy and they get pregnant shortly after dating. They are 16 and 18. She's older than him. He grows up into looking more like a man. They have a son together and are a family after 2 years. Their sex life is great even though she's a little less attracted to him but it works. They are even emotionally connected. Would this stop her from being a lesbian if she still likes only girls besides him?