Tell her you meant that you love her with the Love of the Lord, but not anything beyond that, unless you do of course, then you should tell her that you might maybe have certain feelings for her, but you don't know if those feelings are really love in the same way that she thinks about love or thinks what that love is, or might be, etc...
Look, you need to know how you really feel about her, and I mean really feel about her, and then tell her the truth, (since it's too late not to now) but also tell her that you think it is very wrong for her to even ask as she has already committed herself to someone for life, and that even she divorced him, you would still not ever have any kind of relationship with her in that way, because it would be very wrong, and you would still be committing adultery yourself, (and her as well) which you need to tell her you just won't ever do, etc...
Tell her your a Christian and are committed to God, and because she's married or already been married, that even if and especially if she got a divorce, in this case, you could not and never ever would not, especially in this case, never, ever be with her, ever, period, and make that very clear...
And make sure you stick to your guns and stay truthful to that, etc...
And as another poster already pointed out, if something like this ever happens ever again, tell them that it is inappropriate for them to ask, and refuse to answer, for future reference...
But it's too late now right...
Sort out your own feelings first, is it love or is it lust, or just butterflies or infatuation, etc, and if you must tell her, tell her that even if you tell her, in this case, because of your love and commitment to the Lord, which takes precedence, you two can never ever be together, ever, in this case, even and especially if she got divorced, in this case, etc...
Cause it would be like you betraying your God, etc, and then be done with it, and tell her you can't even associate with her ever even, if she is going to keep this up with you, after that, etc, cause it would be very wrong and very inappropriate, etc, for both of you, etc, and you would have to break off and cut all ties with her because of it or that, etc...
OK...?
You should have never answered the question in the first place, and I would take that as a lesson for future reference, and you may have to stop associating with her altogether, and you need to tell her about that (now) also...
God Bless!