Yeah, she's really fun.
So far I don't get why people insist on saving meter for her HD so often, meterless damage is not bad but anything tagged on at the end scales like crazy. You can get similar or better damage by supercanceling splash whenever the opportunity arises, you also continuously use and build meter this way. You are also building meter mid combo as well, so many times I had my meter finish building just when the Splash followup hits.
EX Splash is so fast, looks very brutal too. The invincibility on it doesn't seem very reliable though, pretty small window.
That string you mention is very solid, makes for a nice frame trap too. I prefer doing it after cr.B x3 instead of sweep though, lets you hit confirm into a combo or transition into the block string if they are blocked.
In terms of pokes I think far s.C is my fave right now.