A good mix (and recipe) for new mum's sore bits

[relgftgh]

Having just spoken to my sister, her second degree perineal tear is still gaping open and not healing, 2 and a half weeks after her traumatic forceps delivery. Other than this, things are fine.
After doing a bit of research, I am eager to make an aloe vera gel mix for topical use (kept in the fridge), with some healing essential oils added to promote healing.

I've decided on spearmint (antibacterial, and a deliciously calming aroma) and some lavendar too (again, to relax).
Any additional info on this would ber wonderful, as would any other oil recommendations.
Some guidance on quantities would also be very helpful!

Many thanks,
Sarah xx