hi my sister is 7 now but i remember she was like ur daughter, good during the day and slept heavy at night. my mum used the dry night mats you can buy plus a water proof matress protector so any accidents can be easily changed without getting a wet matress. explaining to your daughter what you are doing and what will happen if she wets the bed without a nappy, and if you find it easier for her to call you can take her yourself to take her to the toilet then you should do it, as if your calm and at ease with it the your daughter is more likly to be aswell,
if she does have accidents, which is likely dont make a big deal about it as this will make her feel upset and may make wetting herself more common as a nervous thing, just calmly explain that her bed is wet and next time she needs to go to call you, you can leave a potty in her room incase she prefers that. if she is made aware that her bed will be wet she will more likly wake up b4 the accident happens as a subconsous thing.
these things can take time and many accidents but chances are each accident will help her understand and learn, just be calm so she is to, good luck!
sarah xx