If the girl grew up MO and became much more BY-type in seminary, then there should be no hashkafic issues between them.
H/t:
I am an ex-Modox bochur in the parsha who became Charedi in Yeshivat Ohr Yerushalayim. I have been in the Yeshivish velt for four years.
A lot of BY type girls (some as old as 23!) refuse to go out with me because they truly believe my family’s lower level of frumkeit can cause Shalom bayis issues!! This is wrong!