Having troubles against corrin as mario, Any help is appreciated.

Hey guys as the title says having a bit of trouble with Corrin as Mario. My friend friend has picked up Corrin and I just can't seem to deal with her in any way shape or form. Corrin's Fsmash feels like it has no end lag and can go straight into spot dodge then back into fsmash to get that little tick before I can react after I've been spot dodged. aerials are close to no use due to Corrin's nair or uair. Ill see if I can get a video as I know they help. I can handle Corrin as cloud and a few others but for some reason I cant with my main and its frustrating. Thanks for reading.