Things here are broader than the physical. Not for all people who are depressed, but a general absence of desire is common. It includes desire for physical things that you may have once liked or collected. Lack of desire for social things like friends or lovers or perhaps any contact with other people. Even the desire to be alive, which for most people is just a given, can be absent. I, for example, was not actually suicidal, I just had no desire to exist, but also no desire to put forth the effort to end my existence.

I didn't interpret that in the sense of material items. If work and love are things then experiences in general are things.

In that abstract sense wanting things isn't materialistic. Even if you want to live in a cabin on Walden Pond, you still want a "thing".

I think this is meant in the context of having goals for oneself, some drive about something(s) to make you want to get out of bed ... not simply consuming products you don't need

seems like you've confused yourself with a literal interpretation

Desire is the root of human suffering. This is a widely held belief to put it mildly.

More precisely, desire is seen as the root of human suffering by, most commonly, Buddhists.

Isn't it interesting that she was seeking out Buddhism?

The other philosophy that thought about this, but on a more intellectual level, was Stoicism, which was very popular in the Roman empire.

Which is pretty ironic, considering that the people who completely lack desires tend to be those suferring major depression much more than those who have achieved an enlightened serenity.

As someone who has grappled with fairly severe depression, it's not that you have no desires. Your body does a decent job of making sure you maintain your body by giving you plenty.

I would merely say you have no rational desires. As a human your are functional, but as a rational human you've hit a wall.

I can't definitively say I've been depressed, but is it fair to say that you still have desires and want things, but it feels like there are insurmountable barriers between you and desires/things?

Yea, I think that's fair. I think it's also pretty subjective, so it wouldn't surprise me for people to experience it differently. But whatever is wrong or blocking one or one's desires (or whatever) is in one's brain, if not one's control.