It may be that Merkel will stick to that line but it is far from sure. German business has close ties and investments in the UK. Also Germany, next to the UK, is the biggest loser from Brexit as it will lose its most significant ally in terms of policy. 
For now all effort is towards not ruffling the electorate - the polls are favourable. After the election will be the time to listen and act on the concerns of industry provided  the projected CDU/CSU win materializes; if not all bets are off.