Holly Holm isn't old.
Her boxing record is 33-2.
MMA record is 10-2.
Kickboxing record is 2-1.
Overall she is 45-5.
50 professional fights is some wear and tear.
Randamie kickboxing record is 37-0.
MMA record is 6-3.
Overall she is 43-3.
Valentina is also a decorated kickboxer with a 58-2 kickboxing record.
In terms of fighter lore, it is said that with aging fighters the first thing they lose is their reflexes.
Why would Germaine want to have access to good sparring partners for wrestling and Jiu Jitsu? She is fighting Holly Holm! A professional boxer and a kick boxer after that before joining the UFC. Training for wrestling and Jiu Jitsu vs primarily a striker would be a waste of time.
Holly Holm was very accurate and sharp when she fought Ronda Rousey.
In her fights after that, her accuracy seems to have declined. She didn't land many punches or kicks on Miesha Tate or Valentina Shevchenko.
Most MMA fighters from europe come to the united states to train. It might be said that america has some of the best MMA teams, coaches and trainers.
Germaine De Randamie training in holland, I don't know if there are many skilled coaches or sparring partners there for her to work with.
Holly Holm has been working with Israel Martinez, Jon Jones and Anthony Pettis wrestling coach. Holly's wrestling is also very good in addition to her boxing and kickboxing.
Holly could go for a takedown if that is where her team thinks Germaine is weakest.