我今年高一,有个很远房的表姨在澳洲答应要资助我去澳洲读大学,但只提供前两年的学费,爸爸妈妈都是工薪阶层,我们家家境也一般

我今年高一,有个很远房的表姨在澳洲答应要资助我去澳洲读大学,但只提供前两年的学费,爸爸妈妈都是工薪阶层,我们家家境也一般,但是我们都不想放弃这次机会,因为没有她的电子邮件和电话的关系,所以一直没能联系上她,很抱歉,这次终于有了她的地址,不管今后是否要出去,都表示我和我们家衷心的感谢,非常非常非常感谢她在那么远又那么忙,还挺远房的,居然还能想到我.而且,我一定会尽自己的努力好好学,有能力的话一定在以后把钱还给她,
下面是我今天写的,还是希望有人能帮我修改下,或者修正下语法错误,或者,我这么老是说谢谢会不会太罗嗦?kaqi~
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Dear aunty Hong,
Words could hardly express my heartfelt thanks for your generosity and your kindness to sponsor me to finish my study in Australia.I know that you are a busy person and I really appreciate you taking your time thinking of me.How I regret that I'm now thousands of miles away from you and can only thank your kind-hearted in this way.
You can imagine how embarrassed we were since we have been fail to get in touch with you all the while.Cause there are no your E-mail address and telephone number.Besides,as you know,for the last couple of months,I have been fully engaged with my study in FuZhou ,which is no access to e-mail.Currently,I come back for few days rest and as will still going back FUZhou for next section study.
But whatever the reason is,it is difficult for me to justify we have not sent any words to you.As the saying goes,better late than never,now I sent you this e-mail,which hopefully can reach you.Please forgive my rudeness.
We haven't seen you since we were met in China,which was nearly two years ago!Grandpa and my parents let me convey their deepest gratitudes to you and we all lookingforward to your next visit to China when they will be able to pay back some of the hospitality we received during your memorable stay in China.With kind personal regards.
Once again thank you so so much for offering me the opportunity!This is like a chance of a lifetime.I will cherish it.I promise you that I will work very hard and I will try my best to repay you someday.
Best wishes to you and your family.And please send my love to XiaoLong and Grace.
Yours sincerely,
Vivian

Dear Aunty Hong,
I am writing this letter to say thanks to your kindness and generosity for supporting me to finish my study in Australia.Also please forgive me writing this letter to you so late.I could not get your contact information until last week.
It has been nearly two years since we met you last time in China.How are you doing?My Grandpa and parents also let me convey their deepest gratitude to you and we are all looking forward to your next visit to China.
Once again thank you so much for offering me this great opportunity!I will see it as a chance and challenge in my life.I promise you that I will work very hard and try my best to pay you back someday in the future.
Best wishes to you and your family.Please also send my love to XiaoLong and Grace.
Sincerely yours,
Vivian