Socialism is not communism.
Communists would have all of us work entirely for each other – you work for the state, and it gives everyone the same salary regardless, and you aren’t allowed to profit.
Socialism just aims to spread the money about a bit, instead of letting fat cats pocket it all. Wikipedia says socialism is characterised by social ownership, which it defines thus:
Social ownership encompasses the various forms of ownership of the means of production for socialist economic systems. It encompasses public ownership, employee ownership, citizen ownership of equity, and common ownership.
Public ownership is only one of the options.
So it’s perfectly possible to be a socialist and be interested in money. If she starts whingeing about stamp duty though – then you’ve got her 🙂