Flying could be right...sometimes the abused are too afraid to leave, and will sometimes use silly excuses to stay.
Either way, your friend shouldn't have said that to you. It was pretty rude.
I stopped using our garbage disposal as much because we would sometimes have issues...I fell your pain. They suck to deal with. My mother in law dump a whole pot of burned corn soup down it once, and didn't have it on long enough. It got stuck somewhere, and the dishwasher started backing up into the washing machine, and leaked through our carpet in the office my husband had just finished in the garage...yuck, He had to get on the roof and use a long snake through the air pipe to get it in clogged....it was nasty!
My house is usually a mess. My friends undestand they need to call first and let me know they want to come over...I know they are not going to give me a hard time, but it gives me 30 minutes or so to run around the house and get some stuff taken care of. They do it out of kindness for me, because they know I may be embarressed, if it has been a rough day.
She may not realize she was being rude, but maybe when she gets her life in order she will, and maybe even thank you for the offer and apologize for being a boob.