It took her a long time toget overthe flu.
Here the underlined part is -

• It took her a long time to get over the flu.
- Here the underlined part is - Phrasal Verb.

Phrasal Verb:
- গুচ্ছ ক্রিয়া।
- Verb + Preposition/Adverb.
- বাক্যে Verb + preposition/adverb থাকলে সেটা Phrasal Verb হয়।
- যেমন - look down upon, give up, look after.
- তাই এখানে, (verb + preposition) হচ্ছে phrasal verb.

• get over (phrasal verb)
English Meaning: to recover from or overcome something.
Bangla Meaning: ফিরে পাওয়া; পুনরুদ্ধার করা।

Source: Cambridge Dictionary.