My turning 17 mths old is bow legged as well. Usually they say their legs will be straighten as they aged- by all the walking and all. I dont worry much as of now as my LO has no difficulty to walk or experiencing discomfort from doing any mobile activities. Also to add on, i will usually massage his legs (tutorial on YT) every now and then. For me, nothing concerning. Unless you worry it might cause a permanent condition to her legs, you might want to check with PD and get some professional advice. Hope all will be well for you and LO. Sending hearts.