Well her lightning won't do anything. And maybe Thor's will? Stormfront didn't actually call down lightning, she used supercharged plasma to create electricity. So she might not be immune to the biggest lightning bolt of all time.
And as far as I can tell he's not only a far better fighter, but tougher and stronger than her too. For example, he tanked a neutron star beaming on his back for a while, and
Spoiler:And Thor is way stronger than Maeve, who overpowered her physically.
Ryan lasered her arms, legs, and half her face off in a split second.
Some of these Boys threads are hilarious.
The Boys is a laughably weak superhero setting based on all the available feats. It could be Thor without Mjolnir without awakening his powers when he fought Gladiator Hulk. Thor would still stomp, as long as she didn't use her flight to desperately flee for her life.