Seems Merkel is just about holding the EU hierarchy in line, but only just... Longish article but gives a good idea of how things actually work..
www.spiegel.de/international/europe/brexit-triggers-eu-power-struggle-between-merkel-and-juncker-a-1100852.html
"On Sunday, Merkel meets with a handful of confidants, including Chancellery Chief of Staff Peter Altmaier. The group examines a variety of different eventualities, including a second British referendum and snap UK elections. Merkel and Altmaier want to do all they can to prevent Britain from leaving, with Merkel saying that the EU should avoid exerting too much pressure. "Policymakers in London should have the possibility to reconsider the effects of leaving," Altmaier says in an interview.
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"It has become apparent in Brussels too just how vigorously the battle is being fought between those who envision a more powerful EU and those in favor of a nation state-led Europe. The front leads through all countries and all parties. "