Bill's spot on.

Some suggestions:
get her out from BEHIND the steering wheel. Show her how to sit on the
SIDE so she (any maybe yourself) can clearly SEE the foresail ....
maybe even putting on a sequential ROW of 'steering telltales' on the
jib/genoa. The 'steering tales' are a long row of 6" long telltales
that start at the luff and run back for about 6-8ft. from the luff and
about 8 ft. above the deck - then she can SEE when the sail is
stalling or is developing a separation bubble. Then, she will SEE the
relationship between the sail's angle of attack and the angle of the
helm.

If you want your wife to better like sailing .... get some of her
sailing girlfriends to take her out on your boat - YOU stay on the
shore !!!!