Well, she has played maybe two top 50 players since then, so she hasn't had many opportunities to beat them. Which is understandable as not many higher ranked players participate on the ITF circuit. And there her results have been very good (she's been sweeping her opposition lately), besides I saw her in Budapest playing Cornet not so long ago and she was scary at times hitting winners at will from any position on the court. Cornet grind out a win thanks to her superb defensive play (and accurate fh topspin - it was played on clay), which is something Daniela can't rely on.
The reason why the German is ranked so low was a difficult relationship with her former coach, but that is behind her and now she is playing much better. She is a former top 20 and a GS quarterfinalist, and once again tennis is mainly about match ups and Groenefeld isn't a good one for Daniela. It will be tough given Daniela's current form. I will be stunned if she drops less than 11 games and then will claim that I know nothing about tennis.
I'll hold you to that.
ALG won five games v. Cornet, so how good could she have played? You saw the match, but the scoreline is one-sided. 30-4 sounds impressive until you realize all but one of those tournaments are on clay. And only two of those wins came over players ranked higher than 112. Daniela (or any other top player) would have awesome results against scrub opposition on their favorite surface. For one, Daniela is 17-2 in matches versus players outside the top 100 the last two years (not counting the loss to Davenport who was 294 at the time). The losses were to Sprem (injured and on clay) and to Vinci (no excuses there). In the 17 wins, Daniela lost a total of one set (to Cibulkova).
Srebotnik-Sugiyama in the second round. 
(She's my fourth fave).