Think that the writing limited her opportunities, and most directors didn't seem to want to expand on her acting.
The Rita storyline didn't work too well - I think it was an attempt (a bad one, granted) at trying to give her more substance.
Yeah, I'm not a fan of the Rita storyline, nor Evans performance in it... Some fans of it feel watching Krystle and Rita was like watching two different people, while I feel exactly the opposite -- in fact, when we used to dub fake dialogue over DYNASTY episodes (circa Seasons 4 & 5) and our version of moany, spoiled Krystle anticipated
exactly what Rita Lesley would turn out to be.
Not that I blame Linda too much; it was an ill-conceived plotline and it also went on
much too long. And, really, what more should she have done with it? (I always like the idea of Rita adopting a markedly different hairstyle once in the mansion, and more semi-comic attention given to her vulgar slip-ups than they did).
When first watching DYNASTY when it originally aired, I found Krystle's shrill shift (and the show around her) pointed and immediate with the outset of Season 3... With four decades to adjust to it, it no longer seems so obvious so quickly. In fact, today, when watching the DVDs, her airy screechiness seems to gradually build thru Seasons 4 and 5, and at one point, mid-way thru Season 5, she seems to catch herself and roll it back for a while.
But over time, Krystle went from sad, soulful and cleareyed in the first two years, to neurotic and cross-eyed --- even when she wasn't speaking.
It's so weird, the shift.
Well... In Beach Blanket Bingo, she sang!!!
Looped, of course.
Come to think of it, maybe Paul Lynde should have played the Carringtons' flamboyant butler for a while, somehow involved with Krystle's kidnapping...!