Maybe I have the wrong idea, but it sounds like you're quite young, inexperienced & lacking any support? Can you find any experienced horse people in your area to help you?
Your horse's hooves may well 'self trim' adequately, but unless they're doing many miles, it generally doesn't happen enough, and even when they do, it pays to check/balance periodically because they can still become imbalanced. So it's definitely a task she needs to learn, but I probably don't need to tell you messing with hooves can be dangerous, especially with a cantankerous horse, especially if you're not sure what you're doing. If you elicit 'kicky' behaviour for eg & this works for her - she wins, you quit - this behaviour will get stronger. But of course, you must keep safety at the top of the list, so it can be far more dangerous to try to hang on. Catch 22. So I really suggest you find someone to train her for you if possible & teach you, leave her alone yourself for now and in the meantime, keep educating yourself about training.
While it sounds like it's probably about training - for you both - it's common for not wanting to go, pick up feet, etc to be pain related, so that needs to be explored too.
If she's 'preggers' I'd be giving preference to her training, to at least get her comfortable & compliant being handled. Firstly she & the foal may need veterinary attention, which she needs to be prepared for, secondly, an unfriendly mare is far more likely to produce an unfriendly, untrusting foal.