I am sorry to hear that Kali ingested 2-3 30mg Vyvanse, and I understand that you are concerned.
She is a big girl, and that is a plus in a toxin ingestion situation, but dogs are very sensitive to the effects of stimulants/amphetamine family drugs. Vyvanse is lisdexamfetamine dimesylate which is a drug in the amphetamine family.
Ideally we need to get this drug out before she has a chance to digest and absorb these pills, and suffer the effects of this drug.
It may be too late now to induce vomiting, and if it has been more then an hour and a half the medication is likely already absorbed and it is too late.
If she is not showing any symptoms yet, (racing heart rate, hyperactivity, possible seizures and collapse),then you can try and induce vomiting with 3% hydrogen peroxide. But if she is showing any symptoms then that is not recommended.
To induce vomiting you can give her 3 tablespoons of 3% hydrogen peroxide soaked up with bread. Then take her outside and run her around to get the peroxide bubbling so she vomits.
If no vomiting in 10 minutes repeat the peroxide dose once.
If she vomits and seems to clear her stomach and be done I would check to see if the pill pieces are present
Once she clears her stomach to try and settle her stomach today after she vomits you can try either:
1) Pepcid-ac (famotidine) at dose of two 10mg tablets every 12 hours.
2) Prilosec (omeprazole) at a dose of one 20mg tablet every 24 hours.
These will reduce stomach acid and should help settle her stomach and reduce irritation from the peroxide.
if you do not have fresh (unexpired) peroxide or she doesn't vomit she should see a veterinarian immediately. This is a serious toxin exposure.
Please let me know if you have any further questions.