My 7yo daughter is sexually harassed. Need help in handling it

My 7yo daughter came to us and told that our maid's daughter (around 9/10 yo) touched her inappropriately in her private parts, kissed her, tried removing her underwear and so on in the name of playing. Initially she had no idea what was going on so she was alright and playful but quickly she realised something is wrong. Since then she started avoiding her. She did not come to us for long time fearing that she will also be blamed for this. Couple of days back, she came to us and told everything. Initially I thought its some weird thing that the girl did influenced by movie or songs and did not understand the gravity of it. Second day, she said she could not stop thinking about it and asked me how to forget it? Third day my daughter told that she could not play with anyone since that happened, even with the people she loved she is now scared inside. Third day, she is weeping that she could not stop thinking about it. I have spoken to her and gave her my support but I don't think its helping. Wanted your opinion on handling this please. Posted in Chennai sub so that the it will be read by someone who understands the ground reality. I am thinking of taking her to counselling but again will it make her fear worse walking into a doctor's office? And yes, that offender is a GIRL aged between 9 to 11 max EDIT: I misjudged the age of offender as 13-14 but in fact it is around 9-10