Welcome to Just Answer. I am here to help you resolve your tax and finance concerns. Please feel free to ask anytime you need extra help.
The Social Security disability benefit is not impacted by your income from trading securities. The benefit is only effected by earned income from work which is, simply put either W-2 earnings (a job) or self employment income. Trading does not qualify as either so you will be fine there.
There are limitations to the things you can do with a Roth IRA account and this is one of the limiting areas. It is not permitted. If you do this you will jeopardize the tax free treatment of the account. Investing is permitted but day trading is not.