She was pissing me off by that point, so I, um, smote her down. She wouldn't die. I stuck her in fire, she wouldn't die. I had her join the family, THEN she died, passing on her deeds to the florist to the newgirl.
It's normal; one of the later EPs (BV?) added protection for visitors so they don't die easily.
Now, the problem is, the girl that I moved her in with, has now disappeared too.........she's showing at the florist, but ISN'T at the florist.
I always put a regular phone at a business lot.
I suggested that you do this so that it would be easier (and more sensible) to force an error on just the phone if it's not working, rather than forcing errors on random or dangerous things and deleting them.
The magic wand can be found in the hack directory, or by searching. If you cannot load the lot, as seems likely at this point, try using the loadlot cheat.
I can't bulldoze - it won't let me.......keeps telling me the lot is occupied, or some such other thing.
This isn't surprising, since you sent another sim to a corrupted lot.
You'll have to rinse, repeat, to retrieve this sim before trying to fix the lot. Also, I'd sell the lot before doing anything with it. As a final tip, whether you get the lot fixed or not, cleanse your downloads. Broken phones are a sign of outdated hacks.