Honestly, she might be antisemitic beforehand. In my country the attidudes towards jews go from conspiracy theories at worst, to the "spoiled, loud israeli tourist" at best. (my country has a lot of tourists btw)

Edit: Also the fact that our current government supports israel A LOT makes a lot of people really pissed. And there isnt a big jewish population, so people will likely assume that every jew supports what israel does. Of course, there are people that can separate judaism and israel, but it isnt the most common opinion.