There are two type of timeshare interests. One is an interest to use a property based on a right to use agreement. Under a right to use, there would not be a deed therefore your mother had no real property ownership.
Another type of timeshare is a real property interest. This would mean that your mother actually had a deed to the property.
If your mother does have a deed then you are going to have to proceed with the full probate process in CA.
However, if your mother only had a right to use contract then you can do a shortened probate process if the value of the right to use the property is less than $150,000. It is called an affidavit for collection of personal property. Here is the probate court's
website that describes how to file such an affidavit. The next link is for an actual form affidavit that you can complete and file. http://www.saclaw.lib.ca.us/Uploads/files/forms/AffidavitCollectionOfPersonalProperty.pdf
I cannot provide you with legal advise. I have provided you with information about the law related to your question. My answer, and any information that you find online, should not take the place of having a consultation with a lawyer in your area to advise you regarding your specific issues.
Please show your appreciation for my candid, accurate information by clicking VERY INFORMATIVE, OR the OR and positive feedback. You should only rate me if you are satisfied with the information I provided you. If you cannot rate me GREAT please do not rate. Give me a chance to make it right by clicking REPLY TO EXPERT.
I appreciate your question and repeat customers. You can request me by beginning your question with "Dear XXXXX..."