This journal is Lily Potter, healer in training at St. Mungo's, very pregnant, etc. They won't have too much to talk about, but they are probably aware of each other.
Andromeda Tonks (tonksontherocks) is, of course, Lucius's sister in law, but I imagine that won't be brought up much, lol.
Amelia Bones (ameliasbones) is a Ravenclaw '68, and currently sits on the Wizengamot. She'd certainly be worthwhile to try and bribe, but it's highly doubtful she'd be amenable.
Lowri Pritchard (lowrimabyn) is a Hufflepuff '75 and a muggleborn. She wouldn't have been noticeable to Lucius, but she did marry a Welsh pureblood from a well-known family. Lucius would probably have tried to network with Rhys before he went off and married a muggleborn.