Rank the 6* so you can eventually bring her to r3. Yes you can also rank the 5* and run them both at the same time. Especially if you throw Wasp or Hood in there.
I would R5 the 5* and keep dumping sig stones into her. Her awakened ability is highly underrated. I had a max sig R5 5* and an unawakened R2 6* and used my 5* over the 6* every single time. Now my 6* is max sig R3 so my 5* is rarely used.
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Unless you’re good at ghost then r5 the awaken 5*
Eventually plan to rank both of them up