If she has just had one year of school, it is not dramatic. However if there is any difficulty for her in adding/subtracting numbers up to 20, I think yes, you should intervene and sort that out by working on number bonds up to 10, then number bonds up to 20. We had little houses with two columns and a pointy roof on top. In one column are 1,2,3 etc; in the other 9, 8, 7 so you see 1 corresponds with 9. Had to get dd to write those up every day and then they had those little houses with missing numbers which needed to be filled in. From there they went on to addition/subtraction. I thought it was very badly taught and really had to start from scratch to sort it all out.
In the second year, presumably they do times tables and I found I had to teach my dd those at home myself. Whatever they did at school achieved little in the end. I expect because dd needed a lot of repetition.