“Getting a cap is unbelievable. I didn’t really expect it this early on, especially with the Six Nations being the hardest tournament,” Prothero said.
“I was absolutely buzzing and getting my cap in front of my family, my friends, it was really special.
“I’m really happy that he [Lynn] has a belief in me and obviously sees something in me.”
Prothero hopes to push for selection in Wales’ final Six Nations game at home to Italy on Sunday (12:15 BST), but recognises she may have to bide her time.
“I think they’re looking at me as a full-back which might not suit me in terms of getting caps because Kayleigh’s [Powell] playing out of her skin,” she said.
“We’re very different, she has a kicking game and I’m never going to outdo her on that because I’m just not a playmaker, but I do back myself in terms of my confidence to beat people and my aerial stuff.
“I don’t mind not playing as long as everyone has confidence in the people who are playing and I’m doing what’s best for the squad.
“If I’m not best for the squad right now, I hope I will be soon.”