She has an extremely narrow palate. I don't know if it is just some Sarault natural feature or she never had proper tongue placement in her youth aka mouth breather. I've also read that narrowing of the palate is observed in some CPAP users. I would also agree she does have small teeth, but maybe they look that way because she's fat.
I went looking for some full Fatso smiles, this is what I found in my 2 minute search.
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Full smile laughing.
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Full smile in Lokma ecstasy.
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This is a side by side comparison of FB glamour shot compared to Peetz's camera picking her up in the background. This is probably a full natural smile and the true size and shape of her face/head.
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I grabbed this one from a YT creator and I think it's been edited to make her mouth appear larger, but I put it in here to show you the state of her molars.