Which preposition should I use in the following context:
- She always finds herself at the centre of awkward situations.
- She always finds herself in the centre of awkward situations.
I feel 'at' should be used in this instance, although it's just my feeling and I can be wrong. Also, is there a general rule which one of 'at' and 'in' should be used while talking about abstract things rather than more concrete things, like buildings etc.?