I agree with treazzure, and will add to not make a big deal when you leave her at daycare. Act excited and happy about her 'adventure' of going, otherwise she might catch on to your fear and upset. And most daycares won't mind if you go visit her briefly the first few months to make sure she's okay.
no children hate their mothers for leaving them at a wonderful, reputable childcare. they just miss them. you can make a point of giving her lots of love, time, and affection when you pick her up everyday.
i dont know of any 13 month olds that are potty trained. she would not be out of place anywhere not being potty trained at this very young age. the schools i taught at always began potty training around 18 months of age (though some parents and children werent ready for another whole year)
my husband and his family speak creole and french and english. he and all of his family members were subjected to all 3 languages from the time they were infants. they are all fluent in each one of them and have never, to the best of my knowledge, suffered any type of language development or speech issues. you should inform the teacher of her ability to speak a foreign tongue and just allow the daycare to use one language all day and maybe you can continue to use the mother tongue at home. give her extra time to begin to speak out clearly in these two languages. she has more to learn than other children. but i know it's definitely possible and it's done everyday