спроси ее, поедет ли она на пикник,

спроси ее, поедет ли она на пикник, если поедет, мы останемся дома с родителями

Результаты (английский) 1:

ask her if she will go for a picnic, if you will go, we will stay at home with their parents

Результаты (английский) 2:

Ask her if she would go on a picnic, if you go, we will stay at home with their parents

Результаты (английский) 3:

ask her whether she will go on a picnic, if go, we stay at home with parents.