Not by Marvel though. The guy who wrote the story flat out said that it was MC2 Spider-Girl because he supposedly loved that character and wanted to use her. I accept the fact that Marvel used and changed the character... Spider-Girl belongs to them and that's their choice.
I haven't read anything post Spider-Verse... but I'm okay with how I last saw her. Not happy, but okay. I hate the name Spider-Woman for May, but maybe she will go back to Spider-Girl once people start treating her like she's way older than she is, or some evil Spider-Woman will re-use an old story line from 616 and May goes back because of that... who knows.
Nonsense. There's plenty of evidence to suggest that it wasn't the canon Mayday [The Unlimited game, the fact there is canonically more than one Mayday with a similar timeline, Peter's leg etc]
Slott is a known liar, he says anything to get a reaction out of fans. I'll go with what Tom and Ron hinted at, the real Mayday is still out there and unaffected.
It's only defeatists that claim otherwise. Don't be one of those.