Help!! Gave baby old bottle with extra formula

You guys 🤦🏽‍♀️ I feel so dumb. Last night I fed my baby around 1:10. She usually will wake up once or twice through the night so I had 2 bottles of water next to the bed for when she did. She ate at 1:10 and then went back to sleep but she only drank like an ounce from that bottle. So I laid her down next to me on her bassinet and when she woke up at 4:45 to eat again I accidentally put the formula in the bottle she already drank from. I didn't even realize till I asked my bf to make another bottle of water and there was still one left. I have searched everything on feeding old bottles and feeding too much formula but Im pretty sure I'm the only one that I have found to ever put formula in an old bottle. Can someone please tell me what to do I feel like shit about it. She doesn't seem fussy rn. It's literally only an hour after she ate but should I watch for sickness? Do I call her Dr? Idk why I didn't see that the bottle was already made but how can that affect her? So I basically added 2 scoops of formula to 3 oz of already made formula that's been drank from. I appreciate any help

My baby is also 3 months old tomorrow