If 70 yrs w tiny SS n raising 1 young gchild if had some self employ for part year $5-7k, not pd self employ tax, might it be good to report pay tax & submit a new form?

When your self employment income is more than $400, you must include it on your tax return and pay self employment taxes. If you have already filed a return and it has been accepted, you must now prepare, print and mail an amended return form 1040X to add the income.

DO NOT change your original tax return until you start the amended return. If you have already changed it from the way it was originally filed and accepted, you must change it back before you start the amended return. Wait until you receive the refund from your original return before beginning your amended return to make sure you enter the correct amount. Here is an FAQ to help you:
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed

An amended return cannot be efiled. You must print and mail it yourself. TurboTax does not print and mail it for you. In normal times, it takes the IRS about 16 weeks to process an amended return. It's taking much longer now.