Well,as I'm sure you're aware you cannot tone a muscle. The look she is seeking will come from losing body fat so that the shape of her muscles is visible. However if she doesn't have a great base, she's just going to look scrawny once the fat has gone.
She doesn't need to train differently to you - she has the same muscles and they need to be worked the same. I'd recommend a full body routine comprised of big compounds with a few isolation exercises thrown in at the end.
Make sure she is eating plenty - so many women try and lose weight by drastically slashing calories which isn't necessary. A 10-15% reduction (from diet & exercise combined) will be plenty.
And please, get her to lift heavy. 1.5kg dumbbells aren't good for anything really

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