Hi - Helichrysum
is precisely the oil to use. It willl help the healing occur much faster. The only concern is getting the oil near the eyes. I've done this myself, and it's fairly unpleasant.
So here are a couple of simple options: 1) Dilute the helichrysum to 10% in a carrier, then apply lightly and slowly to see what she can tolerate. Really, with Heli, the more the merrier, but this is a challenging situation.
2) Dilute to about only 50%, but have her lie back with her eyes closed, apply, and have her wait 15 minutes until opening her eyes again to allow the oil to absorb. She can 'check' if the oil is still an irritant - and either close her eyes again and wait longer, have her face wiped with a tissue or soft cloth, or be lead to the bathroom sink to wash her face with soap and warm water before opening her eyes again.
The lavender would help, though helichrysum is the stronger anti-inflammatory, and more quickly stimulates healing.