I checked DH's voicemail while he was in the shower for him (he knew). He never remembers to delete voicemails once he's heard them. For kicks and giggles I kept listening after the one (it was from Aunt1 letting him know Uncle1 is doing fine and home, but Uncle2 is now in the hospital with a twisted bowel. Yeesh. Can't catch a break). The next 3 were all from BM over the past couple weeks.
"Hey, it's me, it's about SD, call me back."
"Hey, it's your babymama [can I just say now that I hate this term?], wanna talk about SD. Call me!"
"Hey! It's BM. Call me."

I checked and he'd called her back after each voicemail, so it wasn't about the same thing.

I asked what they had been about. 1 had been about what time we were bringing her home, 1 had been about how tall he was ( :? ), and 1 had been to cancel Sunday's visit.

I'd have worded the voicemails something like
"Hey, it's 3LD, what time are you bringing SD back? Call me back please."
"Hey, it's 3LD, I need to know how tall you are (for whatever reason). Could you give me a call back?" (Seriously, wtf?)
"Hey, SD isn't feeling well, I think she should stay home tomorrow. Let me know you got this."

Seriously, how hard is it to say WHY you are calling?? And WHY did she need to know how tall DH was??? Lol