I think she has a right to charge whatever she wants. You as the consumer have the right to purchase her services or not. Any time you purchase a product or service, you are paying because people need to make money and deserve compensation - so why would this specific instance be made explicit? She's not deceiving you in some way, so I'm not sure why what you already know needs to be spelled out. Plus, she's still putting in the same amount of work except maybe not having to commute (the one I see does still actually go into her office to do teletherapy). In fact, it's likely that she had to invest in a subscription service in order to provide teletherapy - unless she's providing it in an insecure manner with a free app.

As for outdoor therapy, I'm not sure how that would be much safer than therapy in her office since you would need to be close enough to have a private conversation and I doubt you want to wear a mask for therapy.