She'll know about it's reactive evolution and play around it, he clearly has a limit otherwise he wouldn't be in this match.
That's not how it works, it doesn't matter how smart he is ya cant just say nah he's too smart he counters everything. Id like to see Stephen Hawking counter a bullet, sure he knows everything about it, trajectory, where it hit, how much force it's carrying, still can't stop it.
And dude, you're kidding right, you're telling me, literally every alien in this match is immune to frozen powers? Because that's basucally what would need to be the case because if he gets hit by it, he done, screwed, dead, Samus wins, he's not changing if he gets hit to something that us resistant because he's already done, no thinking either, that's not how being frozen inside out works.
Also >melting.
No he's not, Samus can freeze lava and fire, monsters that are literally made out of nothing but magma can't thaw it with their heat while being in a pool of magma and once again he won't even be able to switch to a fure alien because his head will be a ice cube. And besides, her beam can freeze solid characters with planet dura, and yes, it's on her profile.