For a large number of other parents this has become a challenge to decide "what will cause my child the greater harm?"
I totally get what you are saying and why you are allowing your dd to mingle prudently with others. Mine are very subdued, and are withdrawn but have occasional angry outbursts. And I've asked myself the same question. But I have come up with a different answer to those letting their teens mingle (I'm not aiming this post at you specifically Tiredteenmother. Raising teens is challenging at the best of times).
I personally think that what will cause my teens greater harm is one of their parents or close relations dying.
Or this pandemic continuing for five years or more so that the economy is totally shot beyond repair.
And before everyone leaps on me and says that last point is ridiculously pessimistic, in September IAG (parent company of British Airways) said that it did not expect passenger demand to return to 2019 levels until 2023 at the earliest. Admittedly that was before the recent vaccine breakthrough, but I am assuming they have good analysts who take that sort of thing in to account.
In other words, the lives of our teens could be ruined even more fundamentally than they are now, if we, and they, don't make the sacrifices now, and this pandemic is allowed to run on and on, destroying their future livelihoods in the process.