I still have to test it myself to actually find out, but... I see. That's a bit disappointing :<
Well, I didn't expect the set to be the easiest ever to play as. Maybe if you just run a TWave/Surf/Extrasensory/Endure set?... Endure+Salac is always an option (since she does have the base speed for it), as well as Endure+Petaya, but Endure+Salac is probably just redundant considering she kind of runs paralysis in all of her sets.
She could try a TWave/Aqua Shower/Wish/Detect set, too. The idea would be to paralyze things, recover whatever damage you're facing, then use the high current HP to either Aqua Shower whatever before they hit you or Aqua Shower-ing the switch-in. It could surprisingly work, and hey, it's good for support: you've got paralysis, wish support and Detect scouting, and that Aqua Shower is bound to hurt.
It... kind of makes me sad to only see her as viable in this way, though. I'll play around with Serene Grace a bit more, study actual proven Pokemon SG sets and see if ASanae can apply that in any way, but other than that, I guess she's stuck with Aqua Shower. At least she can do a better job at it than HEirin since ASanae has way more SAtk and a way to reliably outspeed her opponents...