Amazon's listing for The Unbeatable Squirrel Girl Vol. 1: Squirrel Power has it containing issues 1-5.
The Hachette listing for Vol 2 from a few days ago, has that volume containing issues 4-8.
It appears that the collections are undergoing a little jiggling of content, maybe with vol 1 just having 1-3 and extra material from earlier in the character's history. But this is the kind of thing that might suggest that the series will be ending with issue 8. Issue 2 had estimated North American direct market numbers of 24,621.
Meanwhile Guardians 3000 is having its pre-Secret Wars issues included in a collection with its Secret Wars replacement title, gicing the indication that the comic won't be returning. Sales of its fifth issue are down to 18,155.
Similarly successful titles include
Storm #8 14,155
Deathlok #5 12,053
Guardians 3000 #5 18,155
Loki Agent of Asgard #11 18,623
Nova #27 19,168
Captain Marvel #12 19,199
Avengers World #17 20,228
Black Widow #15 20,581
Silver Surfer #9 21,716
Moon Knight #12 23,486
Inhuman #12 24,689
Other titles at a similar level, Hulk and Magneto appear to be continuing after Secret Wars. Captain Marvel may get a reprieve along with Nova as a result of movie interest. And Inhuman looks like it will be replaced with Uncanny Inhumans.