Bea, strictly speaking, it was your tumor rather than yourself that was
ER+ . . . and you can't test the tumor until there *is* one.

I had ER+ tumors, and could later develop ER- ones (as could any of us).

You may be thinking of genetic testing to find out whether your daughter
has one of the genes that is associated with increased risk of breast
cancer.  If your daughter had the gene(s), she would be at higher risk .
. . but not 100% guaranteed to get BC, I believe.  On the other hand,
most women who *do* get BC, *don't* have the known gene(s) -- something
else is behind their getting BC.

I think doctors will be more conservative about prescribing estrogen
than they were in the past, given recent research results.  And,
personally, if my mother had had BC (she did; died of it), I wouldn't
take estrogen unless the condition it was treating was also
significantly life-threatening.

I hope they may find other ways to relieve severe menopause symptoms, so
your daughter won't have to make that choice!

Ann T.
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I think you are thinking of mutation of the BRCA genes, which is hereditary,
can be tested for and which confer an increased risk of breast cancer.  Here
is a reference.
http://imaginis.com/breasthealth/brca.asp

As Ann T says ER+ is a characteristic of the tumour, not of the person.
What that means is that the cancer cells have significantly more than the
usual number of estrogen receptors, which is what ( or one of the things)
that makes them divide rapidly.  In this respect each cancer is different,
even in the same patient.

Tim Jackson