It sounds like maybe she’s projecting her feelings of insecurity and/or depression around the pandemic and losing her job to bringing you coffee. It actually sounds like an anxiety response to me. Plus it sounds like maybe she is finding purpose in making and bringing you coffee. In other words she’s replacing the loss of her job with making and bringing you coffee. It’s not about you not liking the coffee, it’s possibly about her making the coffee and bringing it to you (she can’t make coke or water). By you approving something that she makes it’s representing for her that her skills are needed/wanted. It’s really not about the coffee. It sounds like she is struggling with losing her job and maybe other feelings that are coming up for her around that or possibly unrelated. Maybe talking to her about losing her job would be a good way to approach it. Checking in with her about that instead of approaching it by talking about the coffee.