[Da_Shrimp]

there’s zero evidence this even was a Saxon goddess

I wouldn't say 'zero' evidence - Bede does mention her and, as the article says, he's hardly likely to have made her up. Bede was a genius and polymath and not prone to flights of fancy. You are right that she's not mentioned elsewhere.

[Cronos]

Bede mentions that he thinks the pagans who lived 300 years before him had a goddess called Eostre.

There are no runes, no monuments, no writings about that goddess, but there are tons about Woden, Tiw, etc. all over the Anglo-Saxon lands.