Re: Two awkward situations..
The first situation if you can I would file with PP. But by your timeline you might be out of time. Paypal gives 45days. Whatever you choose please leave appropriate feedback. I would also encourage her to start using DC on EVERY package.
The 2nd situation. I would hunt down your original FS post. and show the mama that it said "VGUC" NOT "EUC". It probably wont do much good, but its worth a shot?.....I dont know what to say.
Word of advice to everyone. When you sell things. Dont remove the description from your post. Leave everything as is and just put "sold" by it. That way if there is any question later, people can hunt down what the description said. Its always nice to know.