[burk96]

The Wikipedia Manual of Style is a good guide to cases like this

https://en.wikipedia.org/wiki/Wikipedia:Manual_of_Style/Gend...

To answer your question, she/her is correct, and a brief note that she went by Walter at the time is sufficient to avoid confusion.

[anonymousiam]

Thanks! I'm somewhat ignorant of these things, and I did not mean to offend anyone.