PenguHBanswered grow question 3 years ago Repot to a large (6.5L - 20L, depends on strain) pot asap and hope for the best. If it is an auto, you lost a LOT of veg time... They have a fixed amount of time before flowering is triggered and growth stops.
If it's a normal fem seed then no harm done, you just may have to gently break up the root ball and repot her.
All the best!