I would put her on the B-List. She's not
that well known, but she's been a in a ton of stuff (
http://www.imdb.com/name/nm0000327/ ) Her IMDB page shows 69 items she's worked in. Not many actresses her age or even many older can boast about being in that many projects. However, she tends to stay futher from the limelight and focuses solely on acting, it seems.
Her career trend is really debateable. I'd say it's on the downslope currently because she isn't doing anything well known (big blockbusters). However, her IMDB also shows that she has been working on MANY projects just recently. Most of which I believe are indy films.
Now when it comes to talent... I gotta say, she has the skills required to be one of the best (unless my opinions are biased). She's been acting since she was a very little girl and I don't think she's taken a day off since then. She's been playing in many different roles and is really expanding her list of characters she can play. Of course, she's got the beauty. Now all that is left is the recognition. She has made the Maxim Hot 100 list a few times in the last few years, but still she is not that well known by most. I think it will just take one big leading role and she will bust out from under the canopy she is hidden by.