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If the suppression of emotions and memories can cause memory loss, then there's a slight possibility that it may be one of the reasons why Urd can barely remember. We're not sure yet what Urd has truly gone through but I don't think being Reversed and braving the storm and surviving all the same can lead to anything good and her past is still a mystery to be uncovered.
So possibly it's not just because of the side effects of surviving the storm but also suppressing memories and deep emotions of what she'd gone through is the cause of her amnesiac state. It's an interesting thought to say the least.
Also this implies that there's a slight chance of Vertin slowly losing her memories due to blocking and suppressing strong emotions. Which could not only deal some good heavy angst but also parallel Urd's own if she truly is her mother.