She is a support character that is actually quite in line. The only reason she is tiered high is due to her Ultimate, and Ult. Accelerant boost count could be added to her trackers.
- What is not alright is when someone have a gold backpack as Lifeline - then her healing speed is just broken.
- I would also make her ult visible on minimap like normal drops are, and tweak the item rarity in it - getting that purple armor quite early from just ultimate is gamechaning factor. Getting max blue armors and more healing items would be more fitting for a medic.