Hello @markdh, and welcome to the PD support group on Mayo Clinic Connect. While balance and vertigo issues can be part of a PD diagnosis, I would certainly contact her doctor as soon as possible to report these falls. You say that when she comes to, she has no recollection of falling. How long before she "comes to?" This is also important information to give to the doctor when you report this.

In the meantime, it would be best if she had a walker or other assistive device beside her to minimize the risk of falls.

Will you post again after you contact her doctor?