We are entering a zone of opinions. So everything i will say right now is IMO, lol.
IMO hilde is a high octane,high movement, speed based character. If you are going play hilde at a high level you have to master wavedashing with her on both sides. Once you can do that you can start to create her optimal style. Her optimal style is high movement whiff punishing, while also rushing 50 50. Meaning you move around alot just like you where raph. But your main focus should be getting inside and making your opponent guess between c1a/c2a,grab,2k,66k,grab BE into ce and last but not least 22b. If you master the wavedash the whiffs will come to you with open arms.Best far range whiff punisher is c3b. If your opponent gets defensive then rush that shit down. Really she kinda has the best of both worlds but takes alot of input skill. I would say her one weakness is overall attack speed. But the speed plus range of her moves make them still effective even though they arent crazy fast.
There are some specific matchups where you should play more defensive and wait for whiffs. Which is usually just character who totally own her inside(apat,viola,pyrrha ect ect)