I think the challenges your facing are indicative of a wide range of possible causes. I have a rescue mare than went through some of these behaviors. She squirmed when I tightened her girth, moved off when mounting, and often went up a gate without a que from me. I was getting really frustrated, until I checked her teeth and realized she had major sharp points, and was rightfully evading anything that related to riding. Barring a dental issue, there are several health related things that you should check off the list before assuming Lola is just being a pain. Feet, teeth, back, tack fit, are good starting points. Given there are no health or tack pains, try moving Lola around from the ground before riding. See if you get the pinned ears at the trot before you mount her. If she evades you when mounting, put her in a spot where she can only swing towards you. Block her movement forward, backward, and away. If she walks off before you ask, immediately back - several steps fast. Dismount and do it again. I hope this helps some. Let us know what you find and how it all works.