It may be just me, but Maria lost that match because her forehand was awful. Everytime Vika wanted or needed a point she got it by hitting to Maria's forehand.
With Maria lately, her FH does not just become awful.
It starts with bad serving patch(back to back DFs, easy to return serve) than spread other aspect of her games, including but not limited to her forehand.
IN today's match, she had total control of the match with everything (serve, FH, BH) clicking, until she serve for the set at 5-1.
Then the serve totally deserted her.
She struggle to eventually win the set, but she was never the same again from the start of 2nd set and on.
She was playing from behind all the time, having to face several break, while Vika was finding her rhythm.
As I wrote before, this is highly stressful situation to go from holding easily and breaking at will, to constantly face breakpoints in your own serve while the opponent is now holding easily.