US Immigration from England

Hey everybody, so we are about to send off the AOS packet now, I have a question about biometrics. We re living in Coachella Valley, I believe our local office is San Bernardino if anyone has experiences from this specific area. (If not, I d still love to hear your thoughts too). I don t believe our office is closed so I m sure she will have to attend the biometrics appointment during COVID (probably very soon). She plans to wear a mask to her appointment. During her appointment, will she be asked to remove the mask for any reason? If this has happened to you, could you tell me the exact points in which they may require her to remove her mask, if any, and how long that lasts? She is very scared of catching COVID and I don t want her to worry about that on top of immigration stress. Thanks for all input!