The calls seem really unbelievable to me. To begin with, most college students I know don't call at all ... they text. Now I'll grant that she didn't have a phone to text with ... and it was late (or early). But if it was urgent, she'd have left messages ... and then we'd know for sure who made the calls. So I believe they were urgent but made by JR ... and about subject content that he didn't want to leave messages about or it was a coverup, as you note.
I think it has been reported that 1) She was seeing who has her cell phone and 2) if someone from Smallwood could come pick her up.
2 makes more sense, especially since both the phone calls were made to people at Smallwood.
We know the call to DR, but the other call was to a male LS was with earlier at Smallwood. If JR was not close with the male in phone call #2, then it completely rules out that he was calling for "help".
Problem is, we do not know who male #2 is.