Then I would try what I do walk her in and just stand not tied up. Treat and fuss. Have the front bar up but on the empty side down to allow you to move easily
Keep her on the lunge line so if she does shot back you still have her.but you can still get round to do the bar up
Keep her on the lunge line so if she does shot back you still have her.but you can still get round to do the bar up