Hello wonderful new person! I'm Becca, and I have a gazillion characters (minus the one that just died. Say hi, Bertha.).
Alice is definitely wary of her, and (if we clear it with Manda, too) maybe the Longbottoms were among the Aurors that brought her brother and father in? Cuz that would be an interesting sort of dynamic. But, aside from that, she is a pureblood, yay.
Nora Lovegood doesn't know her, but she is a pureblood (Diggory :D) and her husband publishes that darling magazine, you know the one.
Florence Rosier might get along with her, but I don't know. She's a musician and something of a pacifist. But still a DE supporter and purist. Oh, and she's being courted by Rabastan. As far as she knows, she has a good reputation in society, but she doesn't let that stop her from having a good bit of fun.
Hestia Jones is far from a purist, and one of the newer members of the Order. She's nice and cheerful and optimistic (unless you mention her father, who died in July) person, so she won't be mean to Isadora unless she has a reason. But she won't go out of her way to chit chat, either.
Aaand Betty Braithwaite. Who is really a Burke, but she stole her step-dad's last name for her pen-name at the Daily Prophet. She loves Egypt, is good friends with Rosalind Rookwood, and tries not to make too much of a deal out of her grandfather being Caractacus Burke. (So, they're prob'ly related, but I'm not sure how...)
I also have a wolfie, but she doesn't like people outside the pack. My word, I think I actually killed off my only non-pureblood character, outside the Dark Army. Wow.