The answers to your three questions are: yes, yes and yes. However, you should remove 'just', because the sentence is telling us how amazing she looks and what beautiful things she is wearing. You would use 'just' to indicate something that is not up to standard, or of great quality or that is unsuitable for the occasion. e.g. ~ At her wedding, she just wore a simple print cotton dress, with plain flat white shoes, and no jewellery apart from her engagement ring.

yes. sounds very natural. agree with Charlie on the use of just.

si es correcto, lo puedes usar , pero no es algo muy común escucharlo, si lo evitas decir no pasa nada. y si el además en la oración también es correcto

Hi Already is used before verbs to show that the action was finished before the expected time. Mom (On her smartphone to her son): George, can you stop at the store and get some bread on your way home? George: Hi mom, I already did that. I'm almost at the house now. Teacher to students: When you finish this assignment, please email it to me. Student: Sir, I've already done that. What's the next assignment? In addition to is understandable in this sentence but the use in this context sounds forced to me. You're describing clothing; say and. Radio announcer: Today, we have a report on global warming in addition to several on the coronavirus.