You are assuming that your mother will suggest that she act as your therapist but perhaps not. Most mental health professionals recognize the problems inherent with treating family members. In fact, licensing boards have developed a code of ethics that professionals are obligated to follow.
The American Medical Association, an organization of which your mother might be a member, writes the following about this matter:
“Physicians generally should not treat themselves or members of their immediate families. Professional objectivity may be compromised when an immediate family member or the physician is the patient; the physician’s personal feelings may unduly influence his or her professional medical judgment, thereby interfering with the care being delivered … Family members may be reluctant to state their preference for another physician or decline a recommendation for fear of offending the physician. In particular, minor children will generally not feel free to refuse care from their parents …”Anxiety But Don’t Know How to Ask My Mom (a Psychiatrist) for Treatment