Thanks for your query.
The low dose aspirin
tablet is 75 mg each & acute aspirin poisoning
is likely only if she has ingested aspirin 150 mg(ie two tabs) per kg bogy wt. In other words if she is 14 kg ,she need to ingest 28 tablets for serious poisoning to occur.
Considering worst case scenario if she took 6 tablets , she is definitely out of danger.
Be careful in future to keep medicines away from kids & also try keeing in child resistant containers.
Hope you feel relaxed now.