Boob preference??
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It would be worth ringing your midwife in the morning and asking what infant feeding support is available in your area. There could be all sorts of reasons they are struggling with the left, so seeing someone in the next few days would be really useful and will save your right nipple! X
Keep trying with the left but also try nipple cream and silver cups on you right. Also a haakaa with Epsom salts really helps with those blisters but what helps the most is to still try and breastfeed through it even though it hurts. They’re called nipple blebs and they are horrible 😩
Try doing a cradle to football hold. Sometimes babies just prefer to lay on a specific side when they feed. I also recommend using a shield for that blistering until it heals
Just keep trying with the left. But she may have some tension from being born. My first had issues with one side because she had a forceps delivery and one side of her face was bruised so she didn't like turning that way and by the time it had healed it became a preference.