when you play a lobber -- just lob back.  If you try to hit with pace -- you will wear yourself out because all the pace will be coming only from you. Tell her to sit back, stay focussed, admit its ugly tennis and just hit easy with lots of top spin and take advantage of short shots to hit out with angle.  Still crack your serve but take a little off and go for more angle. Get the opponent to really move -- then if the lob is short, you are in easy position to hit a winner.  Its not easy and it requires alot of patience.

Eddie Dibbs and Harold Solomon made a living and a career with that type of play.  Even the big boys can get frustrated with knuckleheads that just lob...