cut it off? It looks fine to me actually. Are you comparing how she looks when she just woke up to when she's ready for bed? They will completely droop when it's bedtime. Well many strains do anyway, but not all. The sativas I got recently do that more than any other plant I've grown so far. If I didn't know better I'd think they were sick every night.
Most likely you are overwatering if it droops too much during the day but with the top as perky as it is you can't be doing too bad.
Isn't it a little late in the season where you are to have such a tiny immature plant outdoors? Here the days are too short already for vegitation and if you're in the same boat you won't get much off that little girl. Plus it is beginning to get a bit cold in the evenings.
Anyway I would not worry about any plant that perks up on top like yours is. Looks fine. Back off on the ferts if it's leafs are curling and remember no or very low N during flowering.
I can't see the yellowing but maybe you need to get a soil ph meter and check the soil, or just dump dolomite lime on the ground either way and water that in to be sure there's no nute lockout.