19 year old daugher, FT student, made $6200. Turbo Tax still lists the $500 "Credit for Other Dependents" on my return. TT say she can only make up to $4150 ?

TurboTax is correct. Her income is not a factor since she is your qualifying child and not a qualifying relative. The $500 Credit for Other Dependents (aka “Family Tax Credit”) was signed into law as part of the 2017 Tax Cuts and Jobs Act and is in effect for tax years 2018 through 2025.

• The new credit allows taxpayers a credit for certain dependents that don't qualify for the Child Tax Credit, such as qualifying children age 17 or older, adult dependents, and dependents who have an ITIN.

• To be eligible for this new credit, the person(s) being claimed must fit the definition of a qualifying child or a qualifying relative, as defined here:

Qualifying child

• They are your biological child, stepchild, adopted child, eligible foster child, sibling or half-sibling, step sibling, or an offspring of any of these;
• They haven’t already been claimed for the Child Tax Credit or Credit for Other Dependents, either by you or by anyone else;
• They are a U.S. citizen, U.S. resident alien, or U.S. national;
• They aren’t filing a joint return with their spouse;
• They are under the age of 19 (24 for full-time students; no age limit for permanently and totally disabled children);
• They live with you for more than half the year (exceptions apply); and
• They didn't provide more than half of their own support for the year.