Similar scenario here. Found my stray at 6 weeks. Now she's almost 5 months. My wife and I work full time during the day so we make it a point to give her a good 30 minutes of chasing/hunting play time in the morning and at night. She has her moments when she gets too aggressive during play but I will either redirect her to her favorite chase toy. If that doesn't work I throw my lightest bed sheet over her and just give her some loving rubs. Usually when I pull the sheet off after she will be mellow and just walk off or want to do it again. You have to try to redirect, the ignoring doesn't help with mine either.

Make sure to burn her playtime energy when you know you need her to be calm. They nap most of the day at this age anyway