I didn't see her with Ob-Wan and Yoda.
That’s because neither of those guys taught Luke how to use a sword.
Or you could look at it as the Force is guiding each of them.
Or, if you prefer, the Force Ghosts of Obi-Wan, Yoda, and other fallen Jedi trained Rey off screen.
Or Rey’s ability with a staff translated to grasping the lightsaber more quickly. I suppose this would only work if you were willing to accept the idea that skill with one weapon might inform skill with another. But no, you seem to have dug your heels in that someone skilled with one weapon has as much chance of learning a second as a person unskilled with any weapons.
Or any other rationalization you want to make. Ultimately though, I don’t think anything will counter your determination to not accept the new films, when really what’s happening is that your opinion of the Original Trilogy was formed by a younger, less critical and more open version of yourself, so its flaws don’t matter as much.
Your adult mind accepts your younger self’s appraisal of the earlier films, and actively works to support that opinion. The new films don’t have such a powerful hook, and so they don’t get a pass. They are subjected to the full criticism of your adult mind.
Under any serious critical evaluation, all of these films can be picked apart and torn down. But the original trilogy doesn’t often face that because at the time we first saw them, all we expected from them was fun.