Need friend advice

So my very best friend and I had a falling out a couple years ago due to her lying to my family about me. It made me and some of my closet family quit speaking for awhile until I was ready to forgive them which was incredibly hard for me. I forgave my family first and we rebuilt our relationships. Well last year I was missing my friend and decided to reach out to her, we’ve been talking for the past year and it’s been good until recently when I learned she had added my family on *** as I seen them like and comment on her posts. At first I decided it was okay and that if I really forgive them then they deserve a chance to show me they can be friends. But last week my dad called me and asked if I was pregnant. Not only am I not pregnant but I was completely taken aback by why he would even assume something like that when I’m very clear on not wanting more children to him every time he has ever asked. He said someone told him but he wouldnt tell me who. I immediately assumed it was my friend because my dad seemed to believe it so much that it would’ve had to come from a source he believes would know that. I was so upset and hurt because now I was defending myself against lies but then my husband pointed out that what if I had been pregnant and we were trying to wait to tell people and she had actually told the truth to them without knowing it. I would’ve been completely ruined by that. I’m at a point in my life that I will almost never defend myself against lies because I believe it degrades me but I also don’t know if I should confront her for it? My personal opinion is that I should cut her off and be done considering it’s the second time she’s done something exactly like this before but I don’t want to overreacting or be the one in the wrong. That’s where you guys come in, please help. I really appreciate whoever reads this and anyone who contributes to advice. Thank you ❤️