We're staying in the rila but we are using a ski school for 3 year and 5 year old. I believe that when we booked the rila did have a creche but it was first come first served. Our ski nanny service is in the Ela hotel through 'Inghams'. Sorry can't help anymore.
We used the Creche over the Christmas period. Our son is 6 and wouldn't have stood at ski school for 5 hours a day. He was in there all day and they gave him lunch. He had at least two hours a day out at the Creche's own ski school. They supplied the equipment etc so less hassle. Cost was in Sterling and was £90 which I felt was money well spend as we all got to ski at our own levels.