Probably you will find an answer in this thread:
 http://www.istripper.com/forum/thread/37335/1?post=548076
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In my case the software is pushing only previews of cards rated 4.66 or above.
1) Zazie Skymm - no, I didn't see her in previews because:
-  e0847 - Snug Fit - is rated above 4.65 but I have that card in my collection,
 -  f0251 - Delicate Tease - rated above 4.65 but this card is too fresh to be pushed,
 -  the other cards are rated 4.65 or below.
 
2) Cara Mell - I can see only one card:
-  f0193 - Astounding - rated above 4.65,
 -  other cards are rated 4.65 or below.
 
3) Stella Cox - I saw her card yesterday or two days ago (I'm not sure):
-  e0790 - Excitable - but today her rating dropped below 4.66, so probably I will never see her again,
 -  other cards are rated 4.65 or below.
 
4) Zoe Doll - her preview has been pushed today:
-  e0829 - Doll House - rated 4.74. I can see this preview couple of times in a week,
 -  e0830 - Working It! - rated above 4.65 but I have that card in my collection,
 -  f0243 - Heavenly Body - rated above 4.65 - has been pushed many times until I bought her :),
 -  other cards are rated 4.65 or below.
 
These are my observations.