I have had PD for ten years. The last 12 months have seen the condition deteriorate more rapidly than the previous 9 yrs. I am 50 now, diagnosed at 40. Pd has changed absolutely everything, I can no longer even stand up. Pd is going to affect mom physically, mentally and emotionally as a result of the physical changes, and chemically because of the physical changes in the brain.
I had become prone to emotional breakdowns, particularly during the last 6-8 months. I was resistant to taking any anti-depressants because of the stigma, however rationalising the situation, I justified their use because having pd means you are chemically deficient.
I started taking Sertraline a few months ago, and have to say that for me they have brought the emotional instability under control. The first 7-10 days on them actually made me feel worse, but I was prepared for that. One thing I was afraid of was being 'drugged' or tranquillised. Sertraline has allowed me to stay completely lucid and aware. You are completely aware of your problems, thought processes and feelings, however, it is just as though someone has switched the worrying part of my brain off. I am less fretful, and no longer feel weepy.
This is only my experience. I currently take Sinamet, Mirapexin, Apomorphine, Clonazapam and Sertraline, and it does not conflict with those for me.
Hope this helps, and that mom's going to be okay.