My guess would be that the second daughter's baptized name was Magdalena Catharina and that both Helen and Lena are nicknames.

1.  Marriage Record:

2.  Passenger Arrival Records: Ellis Island (online at ellisisland.org; image page nos. 0317 and 0318; Explanation of Column Headings), List 65, p. 156:

SALOON, CABIN, AND STEERAGE ALLIENS MUST BE COMPLETELY MANIFESTED. THIS SHEET IS FOR STEERAGE PASSENGERS. LIST OR MANIFEST OF ALIEN PASSENGERS FOR THE UNITED STATES IMMIGRATION OFFICER AT PORT OF ARRIVAL. S.S. Ultonia sailing from Fiume, 2 April 1910 — Arriving at Port of New York, on Apr 22, 1910
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27		28	29
25	Dumele Jakab	23	M	M	zenier?	Y	Hungary	German	Hungary Glogovacs	Father Dumele Jakab Glogovacs	Ill Chicago	25	Y	self	$?	?	uncle Kuhn Anton Bl??? 642 Chicago Ill	N	N	N	N	G	N	5'7"	dark	brn	brn	N	Hungary Glogovacs
26	______ Magdalene	18	F	M	housewife	"	"	"	"	inlaws[?]	"	26	?	husband	?	with her husband	-	"	"	"	"	"	"	5'5"	"	"	"	"	"

This record was extremely difficult to read; this extraction is neither complete nor entirely accurate.  Apparently the person filling out the manifest was a native speaker because, for example, he wrote Glogovacs with the terminal s with the little tail on it (with a cedilla, which my HTML editor won't allow me to enter).  There are additional places where I believe the reason I can't read the record is that the characters used are not English.  But note that the origin is indexed Glovovacz, which may mean that "z" is the proper transciption of the terminal letter.  "Fiume" is the Italian name for the port city of Rijeka, Croatia [part of former Yugoslavia].  On the same page are Paul & Anna STRAUB, also of Glovovacz, but destined for Portland, OR.

3.  1910 Census Every-Name-Index/Images (online at Ancestry.com):  not found, as expected, because they arrived after the official enumeration date (viz., 15 Apr 1910).

4.  1920 Census Every-Name-Index/Images (online at Ancestry.com, Image #11 of 26):  2012 Mohawk St., Chicago (Ward 23), Cook Co., IL, Roll T625_333, p. 178A, SN 6A, SD 1, ED 1264, enumerated 9 Jan 1920, official enumeration date 1 Jan 1920 (extracted by Diana Gale Matthiesen):

1920:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

*

2012

53

114

Dumelle Jack H

Head

O

N

M

W

33

M

1910

Na

1919

Y

Y

Hungary

German

Hungary

German

Hungary

German

Y

Cabinetmaker

Piano Co

W

_______ Magdaline S?

Wife

F

W

28

M

1910

Na

1919

Y

Y

Hungary

German

Hungary

German

Hungary

German

Y

None

_______ Rose S?

Dau

F

W

9

S

Y

Y

Y

Illinois

Hungary

Hungary

Y

None

_______ Lena

Dau

F

W

7

S

Y

Y

Y

Illinois

Hungary

Hungary

Y

None

*Mohawk St

5.  1930 Census Every-Name-Index/Images (online at Ancestry.com, Image #5 of 19):  3654 Oakley Avenue, Chicago City (Ward 47, Block No. 108, 26th Pct.), Cook Co., IL, Roll 490, p. 54A, SN 3A, ED 16-1756, SD 5, enumerated 10 Apr 1930, official enumeration date 1 Apr 1930 (extracted by Diana Gale Matthiesen):

1930:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30
*	3654	6	12	Dumelle Jacob H	Head	O	$7500	R	N	M	W	43	M	23	N	Y	Roumania	Roumania	Roumania	German	1910	Na	Y	Cabinet Maker	Woodworking	W	Y		N
				_______ Magdaline	Wife					F	W	38	M	18	N	Y	Roumania	Roumania	Roumania	German	1910	Na	Y	None
				_______ Helen C	Dau					F	W	18	S		Y	Y	Illinois	Roumania	Roumania				Y	Genl Office Clerk	Retail Furniture	W	N	2
*Oakley Avenue

6.  WorldConnect / Ancestry World Trees (online at RootsWeb.com/Ancestry.com).

7.  Deborah Dumelle Kristmann.  The Dumelle Family of Glogowatz, Austria-Hungary (user pages online at FamilyTreeMakerOnline at genealogy.com).

8.  Email from descendant.