there is a Mitzvah from the Torah to love a Ger.
Gerim should be held in very high esteem.
with my own children, the fact that someone was a Ger, was not critical, but it WAS a factor to be considered. and anyone seeking a Shidduch has a right to consider this factor, and to even make it an instant deal breaker. im sorry but they have that right.
there is a certain element of risk. i know one case, a Ger, a friend of mine, after 5 years of marriage, and two children, gave up his family and Yiddishkeit. now of course this can and has happened with non-gayrim as well. nevertheless it IS a risk factor.
im sorry (truly) that you find this “sickening”, but they have their side of the story as well.
your friend if she asks a Talmid Chuchum (not just a “rabbi”) will learn that her finding a shidduch is completely in the hands of Hashem. what she needs to do is daven FERVENTLY, with tears if possible, both during Shmoneh Esrei and any time she feels particularly pained by being single.
and of course she has to keep trying. she should trust in Hashem, and be confident if possible. she should also daven for other single women to find their Bashert. and you should fervently daven for her.