"...I saw a video on Soapmaking 101 where she tried to use lemons to make soap (really summarizing right now). I don't know all of the ingredients that she used but it ended up not turning into soap. Did your ACV trace nicely or did it take a while?..."
Hopefully Hazel will chime in to confirm, but I believe she compensated for the added acid by adding extra lye as well. I get the feeling y'all are thinking she just added vinegar to the recipe without other adjustments.
Many people add acid without adjusting the lye properly. The soap they end up with will vary depending on just how much acid was added. Acid (vinegar (acetic acid), citric acid, vitamin C (ascorbic acid)) neutralizes some of the lye. If there is less lye to make the soap, then that increases the superfat. Small amounts of acid will leave the soap looking more or less "normal". If a lot of acid is added, however, the soap will end up an ugly soft mess, as Soaping 101's Cathy found out.