Strange gallop..need help please

I have a 10 year old mare and we just started riding her a couple months ago and her gallop is like a roller coaster. It feels like your just going up and down..almost feels like she bucks in the back then the front really fast. Just wondering if there is anything that would help her gallop to be more smooth. Thanks

Does she travel with her head up in the air? Sometimes that will accentuate a rough gait more than a level topline. Have you checked to see if she is in any pain from the tack or maybe her feet are sore. Her back could also be out. On the other hand, unfortunately, not all horses have that lovely flat canter and run. Some of them are conformed so that a smooth gait is impossible for them and they are destined to be rough all their lives.

Well my app. Qh has a REALLY smooth trot, its almost gaited, but not quite. When she goes into a canter, she kinda skips, then she goes smooth. I can't really figure out what she is going but when I am on the ground she lookes normal

Try watching someone else ride her, or have a knowledgeable person watch you ride, see my comments below:

If it feels like she's skipping (or in OP's case bucking) she may be cantering on off-leads between the front and hind legs, and then she corrects herself and all is right. Really watch her feet carefully on the ground to see if the backs and fronts match up leads. She could also just be switching leads in general, I think that would give you a skipping feeling.

Also to OP-- unfortunately, as smrobs said, some horses are just destined to be rough. All you can do as a rider is learn how to ride their roughness... but it will make you a better rider in the end :)

I can't tell the difference, when I had someone else ride her, and my aunt watch her it seems normal, it will be kinda like... skip skip skip.....and then she will go into a nice smooth canter. We just think that that's how she changes leads.

^^ I ride a TB/QH that, due to his conformation, his strides are really long and roung and he's just so...gangly.

For him I can collect him and it makes it a little better, but that's just the way he's made.

First - I hope you are not galloping quite yet.

My guess is she is doing what we call the 'hobby horse' canter. More of an up and down stride than a forward stride. Does her tack fit? Cinch loose enough for her to move forward? Rider allowing her to move forward by letting the mare have her face?

She's 10 - what did she do previous to this time of her life?