mahram

Second husband being a mahram for the wife's daughter

Q: I am getting married to a woman who already has a daughter, from a previous marriage. Would I be a Mahram for this girl, because Allah says:

وربائبكم اللاتي في حجوركم من نسائكم اللاتي دخلتم بهن فإن لم تكونوا دخلتم بهن فلا جناح عليكم

Would it be ok for me to travel with this girl?

Mahram na mile to hajj kare ya nahi?

Q: Agar kisi aurat par hajj farz ho aur uske pas pese hone k bawajood hajj na kya ho aur uske walid aur bhai ne already hajj kiya hua ho tu aesi soorat me wo kia kare kiske sath hajj pe jaye? Aur agar usk pas itne pese hon ke wo kisi doosray ko hajj pe le ja sake tu kia aesi aurat per yeh farz hoga k wo doosre mehram jisko sath lejana chahti ha usk pese bhi de hajj k?