Normal niceness?
Extra niceness?
Do anything for them?
My feeling is that the friendship should carry on as normal, with the offer of extra support, help if needed, but on a day to day basis, meeting for cups of coffee, or lunch out, this should be normal.
As in, if it is inconvenient, say no, as you normally would. No pressure to communicate more often, or reply to texts more readily, just reply at normal rate, and if communication is normally weekly, no pressure to increase this.
All having made clear that friend is available for emergency lifts, shopping etc if needed.