Tenant complaint - AC - proper response?

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Curious how you more experienced folks would handle this scenario:

Situation - two yr tenant, very (overly) communicative, bit of a worry wart but that's fine, better than the other way imo. Class A sfh rental. House is builder grade 2017 construction. 2 story. And I just got this text:

"*Hey xxxxxxx. I think there’s an issue with the A/C or maybe a blockage in the ducts because the a/c is running nonstop but won’t cool below 75 degrees (it’s set on 68 with the fan running). its been hard to regulate the temperature in the house for awhile but more intermittently. It’s running all day and you can barely feel air flow out of the vents on the first floor. This has been going on for a couple days. I’ve tried everything I know to do. Can we have an HVAC tech come out*?"

It's 85 and humid here outside. My ac hardly keeps up at my house some days and that's set at 74. But it's an old unit.

I asked her to change the filters and double check the thermostats (there's independent upstairs and downstairs controls) and get back to me if it's not better.

But how would you all proceed?? I'm hoping she stays a long time so I want to take care of her but at the same time I think it is what it is... Thoughts??