Is it possible to show password reset email success in user password page?
By default, drupal_set_message() is set and displayed on form submission when a new password is emailed. It's possible LoginToboggan is interfering with this but I haven't encountered that in my use of it. 

Alternatively, if you cannot resolve the issue, you can use hook_form_alter() to create your own submission handler on the password reset form, and use drupal_set_message() to re-show the message (or any custom message you provide) on the form. 

function MYMODULE_password_reset_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  $form['#submit'][] = 'my_custom_handler';
}

function my_custom_handler($form, &amp;$form_state) {
  drupal_set_message('An email has been sent with instructions to reset your password.');

}