Night sleep troubles

My dd will now wake up for 2 hours at night and will not go back to sleep until then. Recently she has even started crying which she never did. Yesterday night she even woke up for 3 hours!!! We are tired as we are both working during the week and would like to have consistent night sleep. I am actually thinking of purchasing sleep programs but I dont know if this is a matter of just needing to sleep train her bedtime or is there a medical condition or sleep disorder that she has. For reference, my dd is 13 months old next week and our bedtime routine is as follows: bath, pjs, storytime, lights out, cuddle until drowsy and then will place to bed drowsy but awake. Her sippy is given to her before she goes upstairs but she rarely drinks anything anymore. It ranges from 1-3oz.