Implying having a desktop and a laptop are mutually exclusive...
No. It means that hacking into the PC doesn't mean hacking to the laptop. Jenna's explanation at what she did at the cafe made special mention about her also hacking Jo's personal laptop because it was connected to the network at the same time she was hacking the PCs there. Elaine's laptop was not there when Jenna hacked into her PC.
Can that girl be Elaine? Sure. But there are more things that would make more sense to be Jo:
1. Hair color/length matching Jo's.
2. Jo's laptop hacked. Elaine's laptop not hacked.
3. Elaine's kitchen doesn't have the photo frame.
There's literally no supporting idea that it was Elaine other than "we don't know what Elaine looks like" lol