Don't do what Marblessolveeverything suggests unless one of you is near to native speaker level! You'll make things worse by teaching mistakes especially in pronunciation and grammar!
Instead - does she have friends who only speak the target language? 1:1 time is probably what she needs - some children function happily in groups without needing to understand much language, some are happy on the sidelines, some are left out but know no different or don't mind... For many children and adults 1:1 communication is a more effective way of learning languages than simply being "immersed" in a situation where you can let things flow around you and disengage slightly.
So playdates 1:1 multiple times per week.
If she hasn't made friends try to invite any likely candidates - get her teacher to suggest a couple and/ or try neighbor kids if any are potentially suitable.
If you can't get playdates going try a local babysitter who doesn't speak English or who can handle refusing to speak English. My 16 year old "babysits" for a 7 year old to teach him one of her native languages - she understands his other language but is old enough and self aware/ self confident enough to refuse to speak it and chivvy him to use the target language. She plays with him for two hours and eats dinner with the family and during that time they all speak the target language, which the parents aren't fluent in either. Everyone involved seems really pleased with the arrangement and it has apparently helped incredibly well with language acquisition for the little boy and to a lesser extent his parents have benefited too - she's been going twice per week since September. It's a nice arrangement for all concerned.
Additionally your dd may have a processing issue - this is fairly common and isn't a big deal but is something that she can be helped with and which in many countries school are legally obligated to make reasonable adjustments for (more time in written assesments, tasks explained individually, ensuring she personally knows what the homework is not just addressing the class as a whole etc.). It is worth getting her an assessment - whwre I live you go to your pediatrician who refes you to a pediatric center where the child has a multidisciplinary assessment. Following that you get an official letter with any diagnosis to pass to school/ kindergarten plus a recommendation for you as parents on which types of interventions (OT, psychologist, speech therapy, or whatever) to seek - you go back to your pediatrician with the letter for a referral and then set up the appointments armed with the referral...
Its afaff but worthwhile.