It sounds like your wife is beginning to accept you liking to wear heels.
She may not be ready/comfortable being there while you try therm on but she did go with you knowing you was looking for heels for you.
Some of what you wrote could be read different ways.
When she said the boots you tried at the sex shop were too high it could have been she thought the heel was too high or the price was too high or the leg shaft was to high.
Also when you mentioned shoe shopping she said "for me" which if taken literally meant for her but as you wrote it could mean for you.