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Hi Amanda,
As your little one is consistently waking every 1 1/2 – 2 hours after 1am, it sounds like she has gone through the 4 month sleep regression. Instead of cycling through two stages of sleep she is now cycling through 4 stages of sleep and partially waking between each sleep cycle. Overnight these partial wakes occur every 1 1/2 – 2 hours.
As the start of the night is dominated by deep sleep, your daughter is less likely to wake up after each sleep cycle, which is why she is generally sleeping well until 1am. On the flip side, the middle part of the night and the early morning hours are dominated by stage 2 NREM sleep and REM sleep and these are lighter stages of sleep. As a result your daughter is more likely to wake between sleep cycles (particularly if she is sleeping in an environment that is different to where she fell asleep). And this is why she is waking every 1 1/2 – 2 hours after 1am.
The steps to reducing these overnight wakes can be found in detail in the PDF titled: Managing The 4 Month Sleep Regression which is in the course.
Have you had a chance to read that yet?
Emma