I have a daughter who turned 24 during 2019 so I cant claim her as a dependent. If I paid part of her tuition, can I use the Lifetime Learning credit (I used the American Opportunity credit the previous 4 years).?

If you are not claiming her, no, you would not be able to claim the expense.

Your daughter can count the money, you paid, in claiming the Lifetime Learning credit (LLC) on her return.

If she has less than $4200 of income, in 2019, you may still be able to claim her as a dependent. 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, a relationship test and residence test. Only a QC qualifies a taxpayer for the Earned Income Credit.

Because she is 24, now, sh can no longer be a QC.  But, A person can still be a Qualifying relative dependent, if not a Qualifying Child, if he meets the 6 tests for claiming a dependent:

1. Closely Related OR live with the taxpayer ALL year   (not even one night at the non-custodial parent’s home).
2. His/her gross taxable income for the year must be less than $4200 ($4150 in 2018)
3. The taxpayer must have provided more than 1/2 his support

In either case:

4. He must be a US citizen or resident of the US, Canada or Mexico
5. He must not file a joint return with his spouse or be claiming a dependent of his own
6. He must not be the qualifying child of another taxpayer