Help leaves are turning yellow on the bottom!

What could be causing this? she is almost done vegetating and i dont want to start her flowering until this problem is solved. She has been growing great until now and nothing has changed so any input from you guys would be great.

Please clarify?
Bottom yellowing is usually a N deficiency.
symptoms

more synptoms

i do0nt think its nitrogen but they have started wilting and shriviling up it started with the single leaflets now it has moved up to the 3 prong leaflets. her top leaves look a bit lighter in color and have a curl to them. ill post pictures as soon as i can