As i was falling asleep last night i was making a mental list of all the ways Fleabag subverts Miranda:
Boo and Fleabag both have a passing physical resemblance and sound similar to Stevie and Miranda respectively.
Both sets of women run a business together.
Stevie and Miranda have a love/hate relationship. Boo and Fleabag had a love/love relationship.
The competing for the attentions of men thing that gets so annoying in Miranda is subverted in Fleabag so that it becomes the 'smoking gun' upon which all the drama hinges.
Miranda's mum and Stevie are the two most important people in her life - they never leave her alone - but they piss her off no end. Fleabag loved both her mum and Boo deeply but they're both dead.
Fleabag is a sex addict. Miranda is sort of sex-phobic although she still thinks about it constantly.
If Fleabag thinks Romantic love will 'save' her she's kept it very quiet so far and focussed on the sex. Whereas Miranda rejects the sex but is obsessed with finding romantic love.
Miranda has friends made out of fruit. Fleabag has friends in her head.
Both Miranda's shop and Fleabag's cafe serve as the site for many a 'meet cute'. Except for Fleabag it's not so cute and it's usually people she doesn't want to see and already knows.