[Ambergris is traditionally used as a fixative in the perfume industry, highly prized due to its ability to 'fix' a scent on human skin. Despite the existence of synthetic alternatives, it remains sought after by perfumiers. For this reason and due to its rarity in the natural world (remember that it is produced by less than 5% of sperm whales...
Dunno if it’s the same. I’ve seen the ambergris oil, but she seemed pretty definite about it just being “amber”. Shows you what a total blockhead I am about perfumes. Heh.
Maybe she’s got it conflated with the amber that preserves stuff like Cretaceous-era mosquitos?