joseph: no, she is ashkenazic who taught in an ivrit speaking preschool program.
You asked: Also, is there a common Jewish or halachic standard as to which husband to bury a twice-widowed wife next to?
If she only had children with one of the two husbands then common practice is to bury next to the husband she had children with. I do not know what the practice is if she had children from both.