>>84534780MAY AS WELL
Pearl knew Rose for nearly 6,000 years, and has had 14 to recover, of which she's only made any real progress in the last year or so. To bring things into a human scale, if you knew someone for 60 years that's not even a month and a half's worth of recovery time, with you only making any real progress in the last 4 days.
To clarify, it's not like she's perceiving time at a different speed, rather that long periods of time mean less to her. For a human, a decade is 1/10th of your expected life if you're lucky, while for Pearl that's 1/600th minimum. Furthermore, humans may never get over the death of a loved one, even if they only knew them for less than a decade. Imagine knowing someone for 600 times that and adoring them to the point of them being the center of you life, then losing them. If some humans never recover from less, imagine what that must be like for Pearl.
I think it's totally valid that Pearl's still upset. She's progressing, it's just that it takes a long, long time to completely get over something like that, if you even can.