My 7 month old is scared of new toys

Just like the title says, I bought my 7 month old female Border Collie a bunch of new toys recently, her puppy toys are pretty worn and gross at this point. I tried introducing two of them to her, a rope type squeaky toy and a soft soccer ball. She shies away whenever I pretend to play with them and try to get her to engage. I've tried throwing them, like our usual game of fetch, but she will slink up to them, sniff them and then just come back to me. Is this normal behavior? Did I mess up big time by not cycling her toys more regularly in her early stages?

She has no problem playing with her old toys and whatever piece of nature she finds outside.