You question is unclear as to why the 2019 software would be telling you to amend a 2014 return. That's unheard of.
But, "24 year old full time college student" is a red flag.
There are two types of dependents, "Qualifying Children"(QC) and standard ("Qualifying Relative" in IRS parlance even though they don't have to actually be related). There is no income limit for a QC but there is an age limit, student status, a relationship test and residence test. Only a QC qualifies a taxpayer for the Earned Income Credit. They are interrelated but the rules are different for each.
If she turned 24, in 2019, she can no longer be your QC dependent. To be a dependent, she mus qualify under the qualifying relative rules. So, now there is an income test.
A person can still be a Qualifying relative dependent, if not a Qualifying Child, if he meets the 6 tests for claiming a dependent:
- Closely Related OR live with the taxpayer ALL year (not even one night at the non-custodial parent’s home).
- His/her gross taxable income for the year must be less than $4200
- The taxpayer must have provided more than 1/2 his support (as opposed to the qualifying child must not have provided more than half her own support). This makes a difference when scholarships are involves, as they are considered third party support.
In either case:
- He must be a US citizen or resident of the US, Canada or Mexico
- He must not file a joint return with his spouse or be claiming a dependent of his own
- He must not be the qualifying child of another taxpayer
