Marrying an Unchaste Christian Woman who has a daughter

Okay so me and this woman met in college and she’s 3 years older than me. She’s Christian and tho not as practicing, she does believe in one god. She has a daughter from a premarital relationship at a young age and the biological father is out of picture. Is it Halal for me to marry someone like that? I really like her too and I’m planning to marry her in the future if it all works out well but I wanted to know from a religious perspective, the daughter is 5 years old. And if it’s halal, can I get the source and the teachings for this please? I have seen answers saying that her not committing Zina and repenting would be enough but what about the child, she does regret getting physical but she had a daughter from that relationship, would that still be okay? Jazakallah