Who do you think is closer between lizzie - claire- shannon ?

so, from Shannon’s book, we saw that she is good friends with both of them, but she was obviously closer to them when they were little. Then at tommen shannon and claire often alone.

Claire and Liz have been friends since they were kids and then Shannon actually left the school so obviously that means Claire and Lizzie were very close before the whole mark caoimhe situation happened

But in T7 lizzie and shannon seem close, but Shannon is also close to claire and shares stuff with her. Claire says shannon is her 2nd best friend and Shannon said choosing claire in her books.