It doesn't help that Slott, the guy who took over ASM 11 issues after Grim Hunt (Which was only 4 months after), didn't care about Kraven being alive, as he prefered Kraven dead, so Kraven didn't even show up in ASM anymore and you had to check out other comics to see him, so we don't even get silly plots with him in ASM lol.
Grim Hunt seemed to have the idea of having one of each Spider after it, so Mattie is killed for Anya to be the one teenager Spider-Girl, and Cassandra is killed off for Julia to become Madame Web so Jessica is the only Spider-Woman (And Jessica isn't even part of this, though if ASM#600 with a tease for Grim Hunt is any hint, she was supposed to lol).
So two Spiders were killed, and Cassandra was killed just for Julia to be spared... Yeah, if there was an editorial mandate to trim down the number of spiders, or if it was the writer's intention and editorial didn't care, then post Superior ASM threw that in the garbage can, 'cause we got Cindy from it, then eventually Miles in 616, then Gwen too, and while I'm pretty sure nobody else remembers this, Charlotte left her coma in Marvel Comics Presents#8 vol 3, so yeah...
Hell, if we think about it, it happened even earlier with Kaine becoming Scarlet Spider and getting his own comic, so much for trimming down the number of Spiders, ignored about two real life years later...
Let's make it even worse then, look at the second page I posted, with Mattie asking Cassandra to tell Spidey that she doesn't blame him, and that she didn't cry, with Cassandra promising she'll do so, thing is, Cassandra never got to talk with Spidey, by the time he rescued Julia and Anya, Cassandra was dying and Spidey told Julia and Anya to take care of her while he goes after Sasha, so they never talked, and Julia was the one who was with her in her final moments, and Cassandra didn't tell Julia about what Mattie asked:
(ASM#637)
So, not only Mattie had a cruel death and is generally forgotten about, her last fucking wish wasn't fulfilled, this is all sounding intentionally mean-spirited now that I write it all like this lol.