Wasn’t it implied that she also went back in time just to make sure he didn’t have any injuries that ruined his love for baseball?
Either that or she was just killing two birds with one stone. But the premise also implies that there’ll inevitably come a time where she’s the one that died, unless it’s going by Final Destination rules and he’s fated to die.
Personally I would be curious to see how she acted on the first time she time traveled. Maybe she wasn’t always a tsundere. Either that or this 23rd loop is the last one.