The IRS has updated form 8615 for tax year 2019 and made it available for use, so this is just TT being slow in updating their software.
I don’t know why the 1099-MISC earnings would trigger the kiddie tax, but if it’s taxable income the first tax bracket for either the regular single category or estates and trusts is at the 10% rate. For income that is subject to the kiddie tax, the first $1,100 is not taxed, the next $1,100 is taxed at the child’s normal tax rate, and only above $2,200 are the estates and trusts brackets and rates used (or if the taxpayer chooses, the highest marginal rate of the parent(s)).
If the amount reported on the 1099-MISC is a housing stipend and is supposed to be reported as a scholarship, that would be considered earned income for the purpose of determing the standard deduction, and everything would be covered under the standard deduction of $12,200.
If there is self-employment tax owed, half of that 15.3% will come back as an above-the-line-deduction.
Section 3121(b)(10) of the Internal Revenue Code (the “Code”) allows an exemption from U.S. social security (FICA) and Medicare tax on wages for services performed in the employ of a school, college, or university by “a student who is enrolled and regularly attending classes” at the institution.