do all will have to be probated.

Please accept my condolences on the loss of your mother.   Not all Wills need to be offered for probate, but even if your mother's turns out not to have to be offered for probate, you are still required by law to file the original Will for informational purposes only with the probate court of the county where she had her principal residence. To determine whether the Will must be offered for probate, you need to determine exactly what she owned, and whether any of it passed directly to someone other than her estate under a beneficiary designation or a right of survivorship. If an asset was jointly owned by your mother and another person as joint tenants with rights of survivorship (which is ONLY likely to be the case with some property that was jointly owned, so be careful and don't assume that jointly owned property passed automatically- you have to actually review any joint titles to see how the property was owned), then it's not controlled by her Will. If an asset passed directly to someone other than your mother's estate under a beneficiary designation, that asset is not controlled by her Will. However, if any asset, whether real estate, a bank account, or something else did not pass to someone directly under a beneficiary designation or a right of survivorship, then the Will controls that asset, and the Will will likely have to be offererd for and admitted to probate before that asset can be dealt with. I urge you to get a consultation with an experienced probate attorney before trying to do anything else. Probate and estates have a lot of potential pitfalls that lay people can fall into without good legal guidance. An experienced probate attorney can help you avoid those and save yourself and the estate time and money. 

A Will has no legal effect until a court admits it to probate (proving).  Contact a local probate lawyer.