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Do all of her ovum contain the same DNA or will some ovum have DNA A while others have DNA B? Would testing the DNA of her ovum (instead of blood, hair follicle, etc.) definitively shown a genetic relationship to her children?

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The ova all come from the germline so IMHO it's overwhelmingly likely they would have the same DNA but it's not exactly guaranteed: it depends if her ovaries are chimeric.

It’s more complicated. The germline cells are “chosen” in a very early stage of the embryo, and later they migrate to the ovary/testes. So perhaps the tissue of the ovaries are from one chimera-twin and the germline cells and the eggs from the other one. (Perhaps each embryo selected the germline cells, and both group moved to the ovary later??)

More info (I coud’t find a source with better formatting): http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/G/Ger...

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