Cheesy straight name : MegaMix
Edgy name : The Urban Avalanche
No time for fancyness : Megan
Copyright infringement : StreetShark

I love every one of these

How about Substratum since she can fuse with buildings

Combinatrix

Fuzor

Amalgamate

Melder

Any of these sound cool? XD

Ugh, I've tried to come up with something good, but I'm not getting one I really like XD

Urban Amalgam is the best I've got, and honestly I kinda stole from please_insert_username and Mordenheim ^_^;

I can only think of the latter levels of the evil within with that name considering the final boss was called the amalgam/amalgam core.

Megabite sounds like something that would have suited her more with the belly maw, maybe something to do with drifting because she can now drift through the floors and walls. Possibly something to do with a specific shark, like hammerheads or something.

You could throw all caution to the wind and combine derivatives of both together and call her
surfin shark.