Can I still save this Ophelia?

No, she's awful.

53Atk, 41 Spd (LnD3) isn't too bad imo. Plus with her weapon she'll be using her specials to make up for her Atk.

Look at her stats for when she's level 40, and then go from there. Worrying too much about an attack bane is not gonna help you, and it might actually hinder your progress.

Boons and banes don't "make or break" a character, the skills you give them and how you effectively use their stats is what makes or breaks them.

Let's see...34/36 offensive spread? Isn't that neutral Linde with 1 less atk? And she has a cooldown-reducing tome that self-infantry pulses. I don't see the need to save this unit. She's pretty powerful.

Mine is -atk +res, atleast you got a good boon.
I still use her though, after nearly 200 orbs of no luck I finally got her on her original banner, I still use her even though she has an atk bane, still a great unit.