探親--美國簽證..

當然可以.... 應該冇問題的.

首先上佢地個網睇睇先 http://chinese.hongkong.usconsulate.gov/niv_apply.html
往任何一間大新銀行先交申請費 / 費用係唔會退回的 (申請批刻與否)...... 去到銀行話要攞美國 visa. 銀行就會幫你入數 ka la. 唔使抄低戶口號碼之類 ka lak. 日日都好多人去交錢 ka ma. 比左錢後, 至緊要攞番張收據. 上面有一個 ref. no. 叫你媽媽比你. 因填 e-form 時要的.
比左錢又有 ref. no. 之後, 上番上面個網址. 填 form. 一定要填網上 form ka. 依家領事館唔比填紙既 form ka lak.
填好晒資料之後, 網上預約時間往領事館見佢地 D 職員. 即時知道批唔批 ka lak.
填 form 時, 照填你媽媽係 housewife lor....
去領事館時, 盡量帶多 D 文件. 如佢既結婚証明書, 你既學生証副本之類, 銀行存款証明, 物業証明之類. 一次過比晒個事館職員睇. 講明係去探你.
屆時佢只可以一個人去. 因美國領事館好嚴的. 唔比唔係申請野既人入 ka. 故唔好叫阿爸之類既親人陪佢去啦. 入唔到的.
入去時仲要經 x 光機 ka. 連手提都要放低. 好煩!!
唔識講英文唔緊要 ka. 佢地 D 職員有好多中國人的. 我阿媽都係咁自己攪店.

Not really in your case.

There is a F2 for that purpose. However, F2 applicant must be depend on the student, which is not in your case. So your mother will have to apply a typical B2 Travel Visa.

It will be weak for your mother to get the visa because she lacks of financial support (not necessary income, but also assets) and she has intention to overstay.