Yes I used AI slop for the picture

My head canon is Bell being brought into Loki Familia will lead to begrudging true cooperation  between all major factions Freya/Loki/Xenos/School district/Hestia,  (Bell is the glue and magnet) and a small part of that could include Lefiya receiving a higher tier of magic swordsman training from Hedin than she did from training with filvis and bete .   
I think Hedin would actually enjoy teaching Lefiya and she would catch on quickly to his lessons and when she completed his training his graduation present would be 1 or more of his spells to add to her arsenal.    
Omori would have to write in good dialogue to explain them two training together, but the foundation is there I believe.
Rivera can always teach her more but Lefiya wants to be a magic swordsman and Hedin is better for teaching that role plus he can instantly analyze and give the best advice tailored to an individual.   I think she would also be someone Hedin could use his 3rd spell on once he spends time with her.

I do think that before Lefiya went through her growth with dealing with Filvis she would not have made a great student for Hedin and his methods but now since she is so mentally strong, I believe Hedin is the perfect teacher for her.    
I also don’t think there is any reason for her to learn from hogni and picturing Lefiya using dainsleif makes me think she would be like the dis sisters while using it.


Lefiya/Hedin Training