It most certainly would change the course! I agree with NS, the text citing Yosemite was most likely not sent by her daughter, GP.
Also, I think it unrealistic to expect cell phone data location (cell tower pings, triangulation, etc.) available on this date because tower location data (pings, triangulation, etc.,) requires a search warrant pursuant to US Supreme Court 16-402 Carpenter v US (2018).
Pings/location data not to be confused with call/text history records which are readily accessible. MOO