If your mother owns the home and you do not have either (1) a life estate to reside there; or (2) some lease that lets you stay there (at least for the term of the lease); then yes, she may evict you. It is possible that IF you made the repairs and remodeled in exchange for being able to live there, that you could show that there is an agreement under which you could remain; though you'd also have to show that you have a continuing right to reside there under the agreement (rather than having made the repairs, etc. in exchange for having lived there the past 12 years). You'd also have to prove the agreement, which could be very difficult if your mother disagrees, and also may be barred since many agreements need to be in writing to be enforced, and this may be one of them. You should speak with an attorney with real estate or landlord-tenant experience to evaluate you case; be aware that as a general matter, improving property does not give one a continuing right to reside in it.