I would go for an genetic thing, its called foxtailingg, there are 2 kinds of foxtailing . one comes fromlightstress, the plant protects the Buds if light is to strong// to hot
the other kind of fotailing is genetically baased,,, some strains grow like this and is a little weired but no problem
i had soemplants growing like yours, first strAIGHT on then they went fat,,, but also possible that she goes on like that.....
Some supersativas grow like this
try to bind her down ( softly)