The way I use her (which is rarely), I immediately switch her stance by dodging/dashing back and holding block (same as Nightcrawler and Rocket Racoon). I'm not to sure what the mode is called. Once I do that, I just go to town on the opponent. She does hit very hard but just lacks utility. The reason for switching modes is for the short second of unstoppable while using a heavy attack. Then you can just combo MLLLH or LMLLH, or can get MLLLMH. That is about my extent of using her.
As a side note, is this your first 4* champ? If so, I would not bring her past rank 2 or 3. Once you have other 4* champs, she quickly falls to the bottom of your roster.
Comments
She's good to have for the iso and 5* shards when you dupe her.
Other than that's she's good for the first 8 fights in arena. Also maybe as the sandbag in those fights as well.