Her friend will pay $5 x 7 = $<<5*7=35>>35 after 7 days.
Her brother will pay $8 x 7 = $<<8*7=56>>56 after 7 days.
Her cousin will pay $4 x 7 = $<<4*7=28>>28 after 7 days.
Therefore, she will be able to collect $35 + $56 + $28 = $<<35+56+28=119>>119 after 7 days.
#### 119