Car wont start seemed like a battery issue but second guessing now

So my moms fairly new car for a few months would not start and the battery had to keep getting Jump-started, so we got a brand new battery the expensive one to handle all situations (mind the battery that was already in the car was fairly new also about 6 months old) and now the car is still in its current problematic state. even with a new battery it wont start and needs to be jump started.. and this is unreliable if we have running around to do. any ideas on what it might be...? i know with my old car 1992 Saturn SL2 i had this issue and it turned out it was the Temperature sensor. wasn't getting enough volts and shut my car down for good till it was replaced.. I don't know if the sebring might have same issue?