It really isn't the bilingualism, and your native tongue should be an is her mother tongue.
Children with a very strong first language end up stronger in their second language than monolingual children without a solid foundation in their only language. Children need to be talked to lots and read to in a language which the caregiver speaks fluently, eloquently and consistently. Which language does not matter as long as it is one the caregiver speaks as a native.
With that foundation the child ends up strong in any language they are immersed in and talked to for several hours per day by native speakers.
You'll do more harm than good if you change the language you use with her, and unsettle her further because her primary care giver has stopped speaking her language - that's heartbreaking.
I agree with the childminder idea, some children are not suited to group childcare settings at 2. The setting is clearly wrong for her personally at this specific age - while she's stressed out by the setting she won't be learning, she'll be in a fight, freeze, flight response mode.
At 2 nursery should be able to communicate without relying on spoken language. Plenty of children don't use much language at 2. Children with language delay are as likely to settle into a sensible nursery at 2 as those without - it's not the language.
I spoke only English to all mine until they were 3 and we kept the house English speaking but outside the house we went to German playgroups twice a week, spent hours in the German playground, had German children over to play. The review for each of the children after 6 months mentioned that they spoke better German than a number of their monolingual peers, and that although the boys sometimes couldn't find the German word (girl child loved words and had a typical for age vocabulary before she even started kindergarten) they were astonishingly quick at picking up grammar.