The woman said police have interviewed her four times and police say they are still looking into the possible sightings.
"That is something that we've followed up on," said Kansas City Police Department Sgt. Stacey Graves. "We've haven't discounted it and we have no reason to believe that they didn't see what they said that they saw."
Graves said investigators plan on continuing to follow up on tips and leads today.
"Eyewitness testimony tends to be notoriously unreliable," said "Good Morning America" legal analyst Dan Abrams today. "With that said, the consistency of these two accounts is interesting."
The focus of the investigation this week has been largely centered on Lisa's parents.
The couple has retained two lawyers: well-known New York defense attorney Joe Tacopina and a local Kansas City attorney.
An anonymous benefactor is offering a $100,000 reward for Baby Lisa's safe return or the conviction of whoever took the little girl.