It's clear from the jedi tales she attended the funeral with a visible pregnant padme. She knew they loved each other but never said anything. For ahoska it wouldn't be a surprise that padmes death was a catalyst for anakins fall. The only thing she didn't know was it was anakins fear of it that caused it. She even mentioned not been able to save anakin when talking to bail organa.

It's clear from Tales of the Jedi that she attended the funeral with a visibly-pregnant Padmé. She knew they loved each other but never said anything. For Ahsoka, it wouldn't be a surprise that Padmé's death was a catalyst for Anakin's fall. The only thing she didn't know was that it was Anakin's fear of it that caused it. She even mentioned not being able to save Anakin when talking to Bail Organa.