She will grow into her ears!
Really.
I know what you mean though, I wanted the ears to tip also, but I have to say, it's a "pain". It wouldn't be but you will probably have to do it much much longer than normal because she's older and then it might not "take" or one ear could tip and one not. Most show breeders begin tape/gluing at 7 weeks old and continue through 7 or 8 months or however long it takes for any one particular dog. I let Chloe's ears go "up" after giving up on the tape, medical cement and Unisolve. No, it's not that hard but struggling with a wiggly pup by myself was hard. And too, when they play and rough house around they normally need fixed again. Both my breeders are not in close proximity to me where I can just hop over there for them to do it.
And nobody in my area knew how to do Collie ears except for one of the Sheltie breeders here locally and I even tried to offer her $25.00 each time Chloe's ears would need re-taped/glued or braced if needed and she declined.
Actually, 86% of all Collies are born with prick ears, it's not common to find those that do have naturally tipped ears. So really prick ears are natural. Ele's in her gangly, baby colt, lanky, big head age right now. LOL......but she will grow into those ears! My daughter used to ask Bailey just how many stations do you get on those ears?