Just spoke to vet again as she’s having trouble peeing.
They said fatty stuff can come from a superficial tear, usually seen with dead lambs and in ewes in good condition which, as a first timer, she definitely was. They said this can cause fibrosis which may stop her from getting in lamb again but we obvs won’t know that until next time.
They are prescribing me a course of Synulox and another painkiller for her - say it sounds like she has vaginitis and urinary tract infection.