The first step in becoming a legit hero, as any aspiring hero knows, is to establish a secret identity. You need a "mask", for a lack of a better word, to hide behind when you aren't doing heroic things.
Obviously, since you're now female, you should stick with some variation. And more importantly, you need a cover identity that gives you plenty of opportunities to disappear without anyone getting wise.
Maybe...a student? Students get as much free time as they want and they generally aren't missed or noticed the same way adults are. Of course, you would want to be an older student, since that would give your cover identity more maturity. That's it! You'll be a female college student.
This new identity of yours needs a name, but right now you need to focus on something more obvious: you look way too old to still be in college. Judging from your hair alone, the transformation process seems to have you stuck right in your mid-30s, at least a decade older than you want to be.
So, how to look younger? Well, your body is made of rubber. It's malleable. You just need to shrink yourself down a little.
First, you pinch your waist in a bit and press in the layer of fat that seems to inevitable accommodate the aging process. Then, you work on smoothing out the wrinkles on your skin, making sure that it is as smooth as any over moisturized 23-year old ought to have.
Next, you work on your face. Your features need to be smaller, so you spend well over an hour pinching and pulling them until they look believable. Finally, you grasp your hair, which also needs to be in a different style. But which one?
Thinking back, you remember always wanting to try a pixie cut, but never actually having the courage to get your hair cut like a girl's. That isn't an issue any longer. So you knead your hair back into your head and then literally spread it over your scalp, making sure the edges look naturally curved. Last but not least, you remove your superhero uniform by having it essentially melt into your skin. There you stand, a naked girl who can easily pass for a soon-to graduate college student.
And damn, do you look sexy. You find yourself putting a hand to your soft young skin, feeling how supple your breasts are, or how crisp your short hair feels when you twirl it in your finger. So this is what it feels like to be old and then young again.
The next thing you know, you've passed out on your bed. Your fingers are soaked with fluids from rubbing yourself.
Enough time has been wasted. You need to shower, and then find some clothes. And some food. It's time to make this new identity of yours a real person.