Answer:
She said she was learning English those days.
Step-by-step explanation:
When using direct speech, we quote exactly what was said by someone else, verbatim. When using indirect speech, we do not quote them, but change some of the elements to refer to what they said. "I", for instance, becomes "he" or "she". Verbs in the simple present are usually changed to the simple past. Time expressions also change to represent the time when the conversation happened - "tomorrow" becomes "the following day", for example.
Having that in mind, we can change the sentence below in the following manner:
- She said, "I am learning English these days." --> She said she was learning English those days.