Can anyone help me with my NL/BB

out of my 6 plants this is the only really sad... looking one.. but im doing everything the same with it, watching it very close.

Ps, I had a friend with a lady bug infestation in her house so I gathered like 75 of them. Put them in my room - they groomed my plants for 2 days and all have died / dissapeared now lol.. I guess that means they didnt have any food to eat yay bug free garden!