oodles
a bit of a roundabout way if you know her maiden name [if married] and a few bits about her family and she was around in 1939, on the register for that year details are redacted if the person is still alive anyone with an ancestry/find my past can look. It won't be instantly removed, so if it was a very recent death it might not show up but it showed up pretty quickly with my parents
Alternatively ask in local facebook groups
It's not a very accurate way to do it! Find my oast will be first to open up redacted entries as they hold the "rights" however I know from personal research and from fellow family historians thst records thst should be redacted are sometimes open and records of people who died decades ago are still closed.