Even Imlie's character is shown strong in this show, but can we imagine a 19 year old might be going through mentally whe she sees such horrible scene in front of her eyes?
In such a short span of time, she has seen and suffered a lot, first giving away her husband to other woman just to keep her husband happy (she didn't pressurize adi to keep the marriage at all as she realized rishte dil se jude na ho to usko jor jabardasti se nhi jod sakte, however, she always believed that adi is her only husband forever phir chahe vo usko apni wife mane ya na mane). And now this suicide scene.....it's a lot for a 19 yr old as compared to other mature family members.