
Since your friend has a terrier, it might be helpful for her to hear my experiences with another terrier!....
I found that my terrier was completely disinterested in toys at eight weeks old, and it took several months before she showed much interest - despite being constantly encouraged - they have to learn how to play. Now, at nearly three years old, she is a toy fiend, and has her own toy chest. She will chase balls, and may even bring them back, but this is mostly an outdoor activity, and balls are not a favourite toy. We found that outdoors she prefers to chase a plastic frisbee - thrown so that it rolls along the ground (presumably it makes her think she is chasing a rabbit!) and then play tuggy with us once she has caught it.
Really her favourite game is tuggy. Rope toys, rubber toys, and especially animal toys. She will also bring you an old bone, and expect you to play tuggy with that. We found that she likes to "chase" the tuggy object before starting to tug, and doesn't like static games - loves lots of movement, silly noises, squeakers etc. If she is excited by a visitor (someone she knows), she will go and get a toy to "celebrate" the visit, and expects a game to ensue (we taught this by simply handing her a toy when she greeted us at the door, and inviting a game of tuggy).
She loves to be chased whilst she is holding a toy -- I think some people don't agree with this type of game, but we enjoy it, and it works indoors and out, and can get her wildly excited. It depends whether you can cope with the barking. We are very bad because we also let her grab our slippers and play tuggy with them, but she is only allowed to do so when invited by the owner of the slippers. I was careful to teach a good bite inhibition by saying "ow" and stopping the game, and she is very gentle with us (though not with the toys)! She understands "drop it" and will release a toy when asked to do so. We have also taught an "enough" command, which means that the game is over.
We cycle the toys, and tend to leave some in the toybox for a few weeks, then get them out, to be greeted with renewed enthusiasm, although some toys are always greeted with pleasure. A few toys are out all day, and she will grab one and wuff at you if she wants a game. Unsurprisingly, she doesn't play on her own, and needs us to play with her. When not playing or sleeping she has a pile of old bones from which she has stripped all the meat, and she will chew, toss and amuse herself happily for ages with one or the other of them. (Mostly lamb leg bones, and they don't smell because she has already cleaned them!)
She is very playful, and we love to see that in her, and we are very silly and noisy ourselves with her. We also play rough and tumble games (again, not everyone will agree with this), but you do need good bite inhibition and the "enough" command well installed, so that the game stops if it gets too rough.
Hope some of the above gives your friend some ideas.
Claire