So if Barbora wins there will be a 3-way tie, as she, Coco and Iga will all have won two matches and lost one. In that situation it come down to % of sets won. Having completed all her RR matches Iga is 4/7 sets (57%).
Here are the possible scenarios:
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Barbora wins in 2 sets. She'll be 5/7 (71%) and Coco would be 4/6 (66%). Qualifiers are Barbora first and Coco second, Iga is out.
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Barbora wins in 3 sets. She'll be 5/8 (62.5%) and Coco will be 5/7 (71%). Qualifiers are Coco first and Barbora second, Iga is out.
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Coco wins in 2 sets. She would be 100% and would qualify first. Barbora would be 3/7 (43%) so Iga would qualify second.
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Coco wins in 3 sets. She'll be 6/7 (86%) and qualifies first. Barbora would be 4/8 (50%) so Coco qualifies first and Iga is second.
Sorry 