I really think this horse needs to go to a trainer (like a horse trainer, who takes horses in for training, not a riding instructor who gives you a lesson once a week) who has experience starting horses, for at least 30 days, preferably 60-90. I really have a strong feeling that this horse isn't even really started, based on the information you've given us about the previous owner and their experience.
None of the issues you're having are things you should be having to deal with as a green rider. At this rate, it'll be years before you ever get to actually start learning to ride. And if you think you're having issues now, with her on the ground, wait until you get on her back... it's only going to get worse.
I would seriously seriously advise you to either send the horse away to a trainer, while taking lessons on a broke horse who knows its job, so you are both more advanced when you start working together.
Or sell the horse and find one more appropriate for your skill level. As you can see, issues are just escalating and there's really nothing any of us can do to help you over the internet. I fear that your problems with your horse are only going to continue to get worse, until you both are so frustrated that you can't stand each other.
Working with horses is supposed to be fun! At your level, you should be learning to ride and handle yourself, not trying to figure out how to train a horse. That comes later, once you have your own skill set more developed.
edit;; the horse isn't going to get much out of being ridden for 15 minutes (or however long the 'trainer' was on her), once a week. A green horse needs to be worked (meaning enough to build a sweat), regularly (meaning at least 4-5 times a week). At this point, with there not being much known about the horse's previous training and the fact that she has sat for months since you got her, I would consider her unstarted. If you brought her to me for training, I would start with her at day 1, where I'd begin with an unbroke colt.
I think the hardest thing is for me to represent her in the most accurate way possible on here. Im not 100% sure if I am able to do this. It also doesnt help that I tend to exxagerate on things at times and I dont nessecarily have the best vocabulary to describe things as well as others.
I know she is definitely broke. Trainer rode her and said shes actually quite fun but she just needs to have more flexibility and balance on her right side.
Yes she had holes in her ground work from her previous owner, but the trainer found her to be quite pleasant when riding her.
Her groundwork is obviously not perfect and still has some things that could be improved but like mentioned to me by other people, you cant get groundwork perfect nor expect it to be or i would be doing groundwork for years. Eventually you do have to get riding when you feel confident enough in them.
Remember that extensive list of excersizes that I posted awhile back that my previous trainer got me to do?
The past 2 trainers including the new one have all said that her groundwork is good enough to be ridden right now and she should be ridden right now. Her weakness is her right side and Ive been working on that by leading her on her right, doing stuff on her right so she is much more comfortable being worked on that side. Shes had enough groundwork over the past 3.5 months.