The council could have at least left a note on the buggy if they didn't know her address.I'm sure they don't have the right to seize the buggy.
We lived in aflat,we kept two buggies on the landing outside ours,both chained up.Ours was the end of the hall though,but downstairs and all through the hallway the old couple opposite had plants and gnomes,various pots and ornaments.Officially nothing was to be in the hall way,in practice if it doesn't bother other residents it was okay.
Poor woman's just had a baby,she's just getting used to being a Mum,and this should have been handled a lot better.You'd think the council would at least be seen to be doing the decent thing.