45 days in to flowering .. its normal with some yellowing fan leavres .. starting at the bottom moving up around week 4 or so ..
if she is root bound you might suffer some yield Im sorry to say .. a repot here is normally not advisable ..
tho I did it .. kind of ..
what I see in that pics is not the size or drain holes of your pot ? (I usealy repot to 5 gallon before 12/12)
I see clawing fan leaves .. so root bound might be a possibility .. but mostlikely a combination of to much Nitrogen and root bound ..
cut the Nitrogen now .. (I don't feed any in 12/12 .. atlest not after the fist two weeks)
also .. its normal that the Vegativ grow stop after 2-3 weeks in flowering .. what you want now is to see the buds bulk out and get dense .. do some research please ..