Your girlfriend sounds like she had personal issues at the moment that have nothing to do with you, the whole covid situation has put massive anxiety and pressure on everyone. She honestly might just need some space. Texting isn't the best way to communicate either, so maybe ring her or video call her? And when you do, tell her straight away how beautiful and amazing she looks. Also, remind her that under normal circumstances you to are fine, and it's this stressful situation that's causing the arguments. Ask her what she wants from you and that all you want to do is help and make her happy, please don't get angry when she doesn't reply, she just might need some space.