Sounds like you just haven’t been aware of what she’s been in.
She had a Best-supporting actress Oscar nomination in 2004 for ‘The House of Sand and Fog’ and Primetime Emmy win in 2009 for Outstanding Actress in a miniseries or movie.
It’s more the case that , as for Michelle Yeoh, older women seem to get meatier roles in science fiction and fantasy than in mainstream or art house productions.
I would love to see Shorleh come over to the Trek franchise in a worthy role. I can definitely see her standing out in the 25th century.