Yeah thats fine just work your way up to a full dose next time maybe give her a whole strength now that your at half. I wouldnt be feeding nutes every watering but she is indica and they eat alot, just be careful.
I'd giver her a proper dose of nutes every other watering.
No I don't think its a waist of nutes if you watered your BlueBerry mom plant every watering . if you do that you might be able to get away with giving it 1/8 - 1/2 strength every watering with out doing any harm. Make sure you do a soil flush once every month to make sure you get rid of any salt build-up
i hardly ever give my mother plant nutes. its big so i just give it water cuz i really dont want it to grow fast. it keeps me supplied with more than enough cuttings