How to send hierarchical data from firebase to goo

below is the hierarchy of my data present in firebase database. I want to send this data to google sheet but I am unable to do so.

Error stated by google sheet is "TypeError: Cannot read property "rytf1JLXetTIINjHNku0yAvs7su2" from undefined. Details"

Below is the code that I am trying to retrieve data. Kindly let me know the mistake. Thank you!

function writeSheets() {
    var ss = SpreadsheetApp.openById("google-sheet-id");
    var firebaseUrl = "database-url";
    var base = FirebaseApp.getDatabaseByUrl(firebaseUrl);
    var data = base.getData('users/admin');

    Logger.log(data);
    var num = 2;
    range = ss.getRange("A" + num + ":E" + num + "");
    for (var i in data) {
        var values = [
            [
                [
                    [data][data][i] // Error occurs here 
                ].email, [
                    [data][data][i] // Error occurs here 
                ].userName, [
                    [data][data] // Error occurs here 
                    [i]
                ].Password, [
                    [data][data][i]  // Error occurs here 
                ].loginState, [
                    [data][data][i]  // Error occurs here 
                ].uid
            ]
        ];
        range.setValues(values);
        num += 1;
        range = ss.getRange("A" + num + ":E" + num + "");
    }

}

Sample Value of data

{
   rytf1JLXetTIINjHNku0yAvs7su2:
      {
        loginDetail: 
            {
              uid:rytf1JLXetTIINjHNku0yAvs7su2,
              password:123456,
              loginState:true, 
              userName:John,
              email:a@a.com
        }
      }
    }

From your question and comments, I thought that you want to do as follows.

You want to put the values of "email", "userName", "password", "loginState", "uid" to the Spreadsheet every row.
You want to put the value from 2nd row of the 1st sheet in the Spreadsheet.

The structure of object data is like as follows. You want to retrieve each value from the object loginDetail.

{
  "rytf1JLXetTIINjHNku0yAvs7su2": {
    "loginDetail": {
      "uid": "rytf1JLXetTIINjHNku0yAvs7su2",
      "password": 123456,
      "loginState": true,
      "userName": "John",
      "email": "a@a.com"
    }
  }
};

If my understanding is correct, how about this modification?

Modification points:

Find loginDetail at the 2nd level, and the object of loginDetail is retrieved.
From the retrieved object loginDetail, each value of "email", "userName", "password", "loginState", "uid" is retrieved in order.
Values of "email", "userName", "password", "loginState", "uid" are put from the 2nd row of 1st sheet of the Spreadsheet.

Modified script:

function writeSheets() {
  var ss = SpreadsheetApp.openById("google-sheet-id");
  var firebaseUrl = "database-url";
  var base = FirebaseApp.getDatabaseByUrl(firebaseUrl);
  var data = base.getData('users/admin');

  Logger.log(data);

  // I modified below script.
  var keys = ["email", "userName", "password", "loginState", "uid"];
  var res = [];
  for (var i in data) {
    for (var j in data[i]) {
      if (j == "loginDetail") {
        res.push(keys.map(function(e) {return data[i][j][e]}));
      }
    }
  }
  var num = 2;
  ss.getRange("A" + num + ":E" + (res.length + num - 1)).setValues(res);
}