Their life....

looks? ( depends on what they obsess about? )

Losing her social standing.

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I'm not trying to be a dick Ezo, but you're being a Pick Up Snob in my opinion.

bbardot: you just reminded me about porn

That's a good one.

Being ostracised from her group if she's young. For these girls consistency and social proof frames work best in your pick up, both are hardwired at an emotional level.

With older women scarcity is a good one (they worry about being left on the shelf) and access to resources in the DHV field.

Looks. Our society defines women by how they look. Ugly women have very little value. No woman wants to be in that situation.

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“Nothing is impossible, the word itself says 'I'm possible'!” ~Audrey Hepburn

No entirely true. Relationships and social status are based on more than just looks. An ugly girl could have great family and friendship relations to increase their social status. Compare that to the beautiful asshole who has bad relationships with everyone including her friends and family, she has no social status at all and ends up lower than the ugly lovable girl.

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I'm not trying to be a dick Ezo, but you're being a Pick Up Snob in my opinion.

bbardot: you just reminded me about porn

Their body.

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Try to live your life like your dream is real

There could be a number of reasons, I do feel that there is not just one standard reason for “a women greatest insecurity”

It might even differ from year to year.

Its not looks. Even if they are insecure about looks that's just on the surface linked to a deeper fear. Ie: they're insecure about looks BECAUSE they're afraid if they were uglier people will think less of them. And so forth.

I would say her social standing and the approval of her close circle (friends & family).

this. at least for girls i interact with (ages 18-22) in college

It depends on the girl and her unique background in terms of both genetics and psychological events during developmental years. Also cultural norms. You can either observe, find out indirectly e.g through friends or use qualifying questions e.g 'most embarrassing moment type discussion' to ascertain a particular girl's.

Aproval of others

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"When I first saw you, I thought you were handsome. Then, of course, you spoke."
As Good As It Gets (1997)

I agree. A girl can be (or think she is) insecure about her looks but its just a projection of a deeper inner fear. There is a strange belief in HB9's and 10's that even if they were just average looking just as many guys would be attracted to them because of their personality, intelligence, wit, style etc etc. They have the looks but still feel a gnawing insecurity which they rationalise and mediate from the amount of guys approaching them but put them in a social situation with a high value group and they feel uncomfortable as they feel like they don't belong. Acceptance within the group is the biggest worry they have.

It's understandable in that 100,000 years ago to be ostracised from your tribe for a woman meant certain death and no chance to pass on their genes. However if a woman had a trait that made her very wary and uncomfortable when this had even a slight chance of happening then she wouldn't risk any dubious or risky behaviour and the "gene" for that wariness and insecurity would multiply in the population making her modern day HB ancestors still feel insecure in the thought of it happening.

Saying the right thing to the right guy. She already knows guys are visual and can only has time to mitigate her looks with her friends before they all get out the door while they're still in-front of the mirror. That's why she spends all day talking to all her friends wondering if she said the right thing.

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The strong live off the weak and the clever live off the strong.