I'd second everything Krysalyss said. She's only a baby so recall, while the most important thing for her to learn, is a big step for her at this stage. I've got an 8 month old boy and his recall in the house, on the verandah etc is great - will come when anyone calls him including DDs - but get him out further away from the house and have him spot a kangaroo and noooooo waaaay. He's like "huh, who's Gus? I don't know anyone called Gus" and off he goes on his merry adventures.

Just keep practising on the lead and then gradually off the lead (we do training a bit throughout the day but always just before his dinner time, with food rewards), but in the meantime if your fencing is secure and she's not traumatising the alpacas I wouldn't worry about it.