Flopping the nuts and getting reraised in Omaha

[kalooki]

New to Omaha, playing PL cash game. Blinds €1/€1.

I have about €400, key opponent has slightly less.

I hold A [img]/forums/images/icons/diamond.gif[/img] K [img]/forums/images/icons/heart.gif[/img] J [img]/forums/images/icons/club.gif[/img] 9 [img]/forums/images/icons/club.gif[/img] , I make it €5 to go in seventh position. A few callers make the pot about €30.

Flop comes 10 [img]/forums/images/icons/heart.gif[/img] 8 [img]/forums/images/icons/club.gif[/img] 7 [img]/forums/images/icons/club.gif[/img] ; the nut straight for me with a flush draw. Checked all round to me, I put in a pot sized €30 bet, everyone folds except for a fairly tight player who check-raises the pot, €90. I believe that this player reads me as loose-ish.

I reckon she must have the nuts, J 9, too. But what are her other two cards? Tens? Clubs?

What should I do in this situation?