I appreciate your concerns, Cuppatea, especially as the service is in a foreign language. A lot of evangelical churches are not affiliated to any mainstream denomination (C of E/ Methodist/ United reformed / Baptist) with clearly defined teaching. it is a very vague term and can cover an enormously wide variation of worship, beliefs and practice.
Things to consider (red flags):
Is there any teaching about about demons/being possessed by demons?
Does the church run any kind of 'exorcism' or demon cleansing service for their members? (Go to the service and ask someone who doesn't know you, someone who is a regular there.)
What is the children's church/Sunday school like, who is it run by, what is the ratio of adults: children, do the teachers have training and are they all CRB checked? What policies do they have in place to ensure children are not at risk of being abused? (Every church should have dealt with all this years ago, and if they are uncomfortable with you asking, it is a red flag.)
What opportunities are there for children to express their own beliefs, and non belief? What happens if a child says they don't believe in God, or that they don't feel what others are feeling?
If they intend for this to be a regular part of her life for years to come, I would want to also know about the teaching and attitudes on things like:
What is their teaching about evolution?
What is the teaching about homosexuality?
What do they teach about death, and what happens to people when they are dead (believers & unbelievers)? Does anyone ever come back to life anymore? Can they be in touch with people once they are dead and is this encouraged?
What is the teaching about Catholicism? other faiths (e.g. Islam)? Athiesm?
What is the teaching about how women should behave or be treated?
What is the teaching on divorce?
What is the teaching on abortion? IVF?
What is their teaching about membership and donations? Where does the money go? (we visited one church which said each person had to pay for their 'seat' in the church...the ones who paid more got to sit in the front, and those not paying sat right at the back or were asked to do the jobs for the church. he wasn't joking. When asked where the money went, the answer was 'mostly the ministers/clergy/pastor's salary'.) 
What is their teaching on leadership?
Do they accept female speakers or pastors/clergy/ministers?
It might be easier to just ask them how they differ from a catholic church, but you will probably not get a very clear picture.
At what age would your daughter be allowed to make her own mind up about going to church with them, and if she did decide she no longer wanted to go, what would they do?
(Not that it is really relevant, but I am a Christian. There are other things I would want to know about, such as preparation for Eucharist, )