I think its more likely that Diora is a b-tier actress at best(more c-tier imo) and she is in a field where past the age of 40 women do not get many roles outside of "Generic mom #34".
It's impossible to know. It's not like there is an interconnected computer network containing nearly all of human knowledge. There are certainly no free movie database websites where one might be able to keep track of movie and TV roles simply by searching an actor's name. One day someone might invent some sort of photo album where you can share your plans to help friends and family keep track of the things you choose to document and share.